Closeable
, DataInput
, ObjectInput
, ObjectStreamConstants
, AutoCloseable
public class ObjectInputStream extends InputStream implements ObjectInput, ObjectStreamConstants
Warning: Deserialization of untrusted data is inherently dangerous and should be avoided. Untrusted data should be carefully validated according to the "Serialization and Deserialization" section of the Secure Coding Guidelines for Java SE. Serialization Filtering describes best practices for defensive use of serial filters.
The key to disabling deserialization attacks is to prevent instances of arbitrary classes from being deserialized, thereby preventing the direct or indirect execution of their methods. ObjectInputFilter
describes how to use filters and ObjectInputFilter.Config
describes how to configure the filter and filter factory. Each stream has an optional deserialization filter to check the classes and resource limits during deserialization. The JVM-wide filter factory ensures that a filter can be set on every ObjectInputStream
and every object read from the stream can be checked. The ObjectInputStream constructors invoke the filter factory to select the initial filter which may be updated or replaced by setObjectInputFilter(java.io.ObjectInputFilter)
.
If an ObjectInputStream has a filter, the ObjectInputFilter
can check that the classes, array lengths, number of references in the stream, depth, and number of bytes consumed from the input stream are allowed and if not, can terminate deserialization.
ObjectOutputStream and ObjectInputStream can provide an application with persistent storage for graphs of objects when used with a FileOutputStream and FileInputStream respectively. ObjectInputStream is used to recover those objects previously serialized. Other uses include passing objects between hosts using a socket stream or for marshaling and unmarshaling arguments and parameters in a remote communication system.
ObjectInputStream ensures that the types of all objects in the graph created from the stream match the classes present in the Java Virtual Machine. Classes are loaded as required using the standard mechanisms.
Only objects that support the java.io.Serializable or java.io.Externalizable interface can be read from streams.
The method readObject
is used to read an object from the stream. Java's safe casting should be used to get the desired type. In Java, strings and arrays are objects and are treated as objects during serialization. When read they need to be cast to the expected type.
Primitive data types can be read from the stream using the appropriate method on DataInput.
The default deserialization mechanism for objects restores the contents of each field to the value and type it had when it was written. Fields declared as transient or static are ignored by the deserialization process. References to other objects cause those objects to be read from the stream as necessary. Graphs of objects are restored correctly using a reference sharing mechanism. New objects are always allocated when deserializing, which prevents existing objects from being overwritten.
Reading an object is analogous to running the constructors of a new object. Memory is allocated for the object and initialized to zero (NULL). No-arg constructors are invoked for the non-serializable classes and then the fields of the serializable classes are restored from the stream starting with the serializable class closest to java.lang.object and finishing with the object's most specific class.
For example to read from a stream as written by the example in ObjectOutputStream
:
try (FileInputStream fis = new FileInputStream("t.tmp");
ObjectInputStream ois = new ObjectInputStream(fis)) {
String label = (String) ois.readObject();
LocalDateTime dateTime = (LocalDateTime) ois.readObject();
// Use label and dateTime
} catch (Exception ex) {
// handle exception
}
Classes control how they are serialized by implementing either the java.io.Serializable or java.io.Externalizable interfaces.
Implementing the Serializable interface allows object serialization to save and restore the entire state of the object and it allows classes to evolve between the time the stream is written and the time it is read. It automatically traverses references between objects, saving and restoring entire graphs.
Serializable classes that require special handling during the serialization and deserialization process should implement methods with the following signatures:
private void writeObject(java.io.ObjectOutputStream stream)
throws IOException;
private void readObject(java.io.ObjectInputStream stream)
throws IOException, ClassNotFoundException;
private void readObjectNoData()
throws ObjectStreamException;
The method name, modifiers, return type, and number and type of parameters must match exactly for the method to be used by serialization or deserialization. The methods should only be declared to throw checked exceptions consistent with these signatures.
The readObject method is responsible for reading and restoring the state of the object for its particular class using data written to the stream by the corresponding writeObject method. The method does not need to concern itself with the state belonging to its superclasses or subclasses. State is restored by reading data from the ObjectInputStream for the individual fields and making assignments to the appropriate fields of the object. Reading primitive data types is supported by DataInput.
Any attempt to read object data which exceeds the boundaries of the custom data written by the corresponding writeObject method will cause an OptionalDataException to be thrown with an eof field value of true. Non-object reads which exceed the end of the allotted data will reflect the end of data in the same way that they would indicate the end of the stream: bytewise reads will return -1 as the byte read or number of bytes read, and primitive reads will throw EOFExceptions. If there is no corresponding writeObject method, then the end of default serialized data marks the end of the allotted data.
Primitive and object read calls issued from within a readExternal method behave in the same manner--if the stream is already positioned at the end of data written by the corresponding writeExternal method, object reads will throw OptionalDataExceptions with eof set to true, bytewise reads will return -1, and primitive reads will throw EOFExceptions. Note that this behavior does not hold for streams written with the old ObjectStreamConstants.PROTOCOL_VERSION_1
protocol, in which the end of data written by writeExternal methods is not demarcated, and hence cannot be detected.
The readObjectNoData method is responsible for initializing the state of the object for its particular class in the event that the serialization stream does not list the given class as a superclass of the object being deserialized. This may occur in cases where the receiving party uses a different version of the deserialized instance's class than the sending party, and the receiver's version extends classes that are not extended by the sender's version. This may also occur if the serialization stream has been tampered; hence, readObjectNoData is useful for initializing deserialized objects properly despite a "hostile" or incomplete source stream.
Serialization does not read or assign values to the fields of any object that does not implement the java.io.Serializable interface. Subclasses of Objects that are not serializable can be serializable. In this case the non-serializable class must have a no-arg constructor to allow its fields to be initialized. In this case it is the responsibility of the subclass to save and restore the state of the non-serializable class. It is frequently the case that the fields of that class are accessible (public, package, or protected) or that there are get and set methods that can be used to restore the state.
Any exception that occurs while deserializing an object will be caught by the ObjectInputStream and abort the reading process.
Implementing the Externalizable interface allows the object to assume complete control over the contents and format of the object's serialized form. The methods of the Externalizable interface, writeExternal and readExternal, are called to save and restore the objects state. When implemented by a class they can write and read their own state using all of the methods of ObjectOutput and ObjectInput. It is the responsibility of the objects to handle any versioning that occurs.
Enum constants are deserialized differently than ordinary serializable or externalizable objects. The serialized form of an enum constant consists solely of its name; field values of the constant are not transmitted. To deserialize an enum constant, ObjectInputStream reads the constant name from the stream; the deserialized constant is then obtained by calling the static method Enum.valueOf(Class, String)
with the enum constant's base type and the received constant name as arguments. Like other serializable or externalizable objects, enum constants can function as the targets of back references appearing subsequently in the serialization stream. The process by which enum constants are deserialized cannot be customized: any class-specific readObject, readObjectNoData, and readResolve methods defined by enum types are ignored during deserialization. Similarly, any serialPersistentFields or serialVersionUID field declarations are also ignored--all enum types have a fixed serialVersionUID of 0L.
Records are serialized differently than ordinary serializable or externalizable objects. During deserialization the record's canonical constructor is invoked to construct the record object. Certain serialization-related methods, such as readObject and writeObject, are ignored for serializable records. See Java Object Serialization Specification, Section 1.13, "Serialization of Records" for additional information.
Modifier and Type | Class | Description |
---|---|---|
static class |
ObjectInputStream.GetField |
Provide access to the persistent fields read from the input stream. |
baseWireHandle, PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, SC_BLOCK_DATA, SC_ENUM, SC_EXTERNALIZABLE, SC_SERIALIZABLE, SC_WRITE_METHOD, SERIAL_FILTER_PERMISSION, STREAM_MAGIC, STREAM_VERSION, SUBCLASS_IMPLEMENTATION_PERMISSION, SUBSTITUTION_PERMISSION, TC_ARRAY, TC_BASE, TC_BLOCKDATA, TC_BLOCKDATALONG, TC_CLASS, TC_CLASSDESC, TC_ENDBLOCKDATA, TC_ENUM, TC_EXCEPTION, TC_LONGSTRING, TC_MAX, TC_NULL, TC_OBJECT, TC_PROXYCLASSDESC, TC_REFERENCE, TC_RESET, TC_STRING
Modifier | Constructor | Description |
---|---|---|
protected |
Provide a way for subclasses that are completely reimplementing ObjectInputStream to not have to allocate private data just used by this implementation of ObjectInputStream. |
|
Creates an ObjectInputStream that reads from the specified InputStream. |
Modifier and Type | Method | Description |
---|---|---|
int |
available() |
Returns the number of bytes that can be read without blocking. |
void |
close() |
Closes this input stream and releases any system resources associated with the stream. |
void |
defaultReadObject() |
Read the non-static and non-transient fields of the current class from this stream. |
protected boolean |
enableResolveObject |
Enables the stream to do replacement of objects read from the stream. |
final ObjectInputFilter |
getObjectInputFilter() |
Returns the deserialization filter for this stream. |
int |
read() |
Reads a byte of data. |
int |
read |
Reads into an array of bytes. |
boolean |
readBoolean() |
Reads in a boolean. |
byte |
readByte() |
Reads an 8-bit byte. |
char |
readChar() |
Reads a 16-bit char. |
protected ObjectStreamClass |
readClassDescriptor() |
Read a class descriptor from the serialization stream. |
double |
readDouble() |
Reads a 64-bit double. |
ObjectInputStream.GetField |
readFields() |
Reads the persistent fields from the stream and makes them available by name. |
float |
readFloat() |
Reads a 32-bit float. |
void |
readFully |
Reads bytes, blocking until all bytes are read. |
void |
readFully |
Reads bytes, blocking until all bytes are read. |
int |
readInt() |
Reads a 32-bit int. |
String |
readLine() |
Deprecated. This method does not properly convert bytes to characters. |
long |
readLong() |
Reads a 64-bit long. |
final Object |
readObject() |
Read an object from the ObjectInputStream. |
protected Object |
readObjectOverride() |
This method is called by trusted subclasses of ObjectInputStream that constructed ObjectInputStream using the protected no-arg constructor. |
short |
readShort() |
Reads a 16-bit short. |
protected void |
readStreamHeader() |
The readStreamHeader method is provided to allow subclasses to read and verify their own stream headers. |
Object |
readUnshared() |
Reads an "unshared" object from the ObjectInputStream. |
int |
readUnsignedByte() |
Reads an unsigned 8-bit byte. |
int |
readUnsignedShort() |
Reads an unsigned 16-bit short. |
String |
readUTF() |
Reads a String in modified UTF-8 format. |
void |
registerValidation |
Register an object to be validated before the graph is returned. |
protected Class |
resolveClass |
Load the local class equivalent of the specified stream class description. |
protected Object |
resolveObject |
This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization. |
protected Class |
resolveProxyClass |
Returns a proxy class that implements the interfaces named in a proxy class descriptor; subclasses may implement this method to read custom data from the stream along with the descriptors for dynamic proxy classes, allowing them to use an alternate loading mechanism for the interfaces and the proxy class. |
final void |
setObjectInputFilter |
Set the deserialization filter for the stream. |
int |
skipBytes |
Skips bytes. |
mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, skipNBytes, transferTo
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
read, skip
public ObjectInputStream(InputStream in) throws IOException
The constructor initializes the deserialization filter to the filter returned by invoking the serial filter factory returned from ObjectInputFilter.Config.getSerialFilterFactory()
with null
for the current filter and the static JVM-wide filter for the requested filter. If the serial filter or serial filter factory properties are invalid an IllegalStateException
is thrown. When the filter factory apply
method is invoked it may throw a runtime exception preventing the ObjectInputStream
from being constructed.
If a security manager is installed, this constructor will check for the "enableSubclassImplementation" SerializablePermission when invoked directly or indirectly by the constructor of a subclass which overrides the ObjectInputStream.readFields or ObjectInputStream.readUnshared methods.
in
- input stream to read fromStreamCorruptedException
- if the stream header is incorrectIOException
- if an I/O error occurs while reading stream headerSecurityException
- if untrusted subclass illegally overrides security-sensitive methodsIllegalStateException
- if the initialization of ObjectInputFilter.Config
fails due to invalid serial filter or serial filter factory properties.NullPointerException
- if in
is null
protected ObjectInputStream() throws IOException, SecurityException
The constructor initializes the deserialization filter to the filter returned by invoking the serial filter factory returned from ObjectInputFilter.Config.getSerialFilterFactory()
with null
for the current filter and the static JVM-wide filter for the requested filter. If the serial filter or serial filter factory properties are invalid an IllegalStateException
is thrown. When the filter factory apply
method is invoked it may throw a runtime exception preventing the ObjectInputStream
from being constructed.
If there is a security manager installed, this method first calls the security manager's checkPermission
method with the SerializablePermission("enableSubclassImplementation")
permission to ensure it's ok to enable subclassing.
SecurityException
- if a security manager exists and its checkPermission
method denies enabling subclassing.IOException
- if an I/O error occurs while creating this streamIllegalStateException
- if the initialization of ObjectInputFilter.Config
fails due to invalid serial filter or serial filter factory properties.public final Object readObject() throws IOException, ClassNotFoundException
The root object is completely restored when all of its fields and the objects it references are completely restored. At this point the object validation callbacks are executed in order based on their registered priorities. The callbacks are registered by objects (in the readObject special methods) as they are individually restored.
The deserialization filter, when not null
, is invoked for each object (regular or class) read to reconstruct the root object. See setObjectInputFilter
for details.
Exceptions are thrown for problems with the InputStream and for classes that should not be deserialized. All exceptions are fatal to the InputStream and leave it in an indeterminate state; it is up to the caller to ignore or recover the stream state.
readObject
in interface ObjectInput
ClassNotFoundException
- Class of a serialized object cannot be found.InvalidClassException
- Something is wrong with a class used by deserialization.StreamCorruptedException
- Control information in the stream is inconsistent.OptionalDataException
- Primitive data was found in the stream instead of objects.IOException
- Any of the usual Input/Output related exceptions.protected Object readObjectOverride() throws IOException, ClassNotFoundException
ClassNotFoundException
- Class definition of a serialized object cannot be found.OptionalDataException
- Primitive data was found in the stream instead of objects.IOException
- if I/O errors occurred while reading from the underlying streampublic void defaultReadObject() throws IOException, ClassNotFoundException
ClassNotFoundException
- if the class of a serialized object could not be found.IOException
- if an I/O error occurs.NotActiveException
- if the stream is not currently reading objects.public ObjectInputStream.GetField readFields() throws IOException, ClassNotFoundException
GetField
object representing the persistent fields of the object being deserializedClassNotFoundException
- if the class of a serialized object could not be found.IOException
- if an I/O error occurs.NotActiveException
- if the stream is not currently reading objects.public void registerValidation(ObjectInputValidation obj, int prio) throws NotActiveException, InvalidObjectException
obj
- the object to receive the validation callback.prio
- controls the order of callbacks; zero is a good default. Use higher numbers to be called back earlier, lower numbers for later callbacks. Within a priority, callbacks are processed in no particular order.NotActiveException
- The stream is not currently reading objects so it is invalid to register a callback.InvalidObjectException
- The validation object is null.protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException
The corresponding method in ObjectOutputStream
is annotateClass
. This method will be invoked only once for each unique class in the stream. This method can be implemented by subclasses to use an alternate loading mechanism but must return a Class
object. Once returned, if the class is not an array class, its serialVersionUID is compared to the serialVersionUID of the serialized class, and if there is a mismatch, the deserialization fails and an InvalidClassException
is thrown.
The default implementation of this method in ObjectInputStream
returns the result of calling
Class.forName(desc.getName(), false, loader)
loader
is the first class loader on the current thread's stack (starting from the currently executing method) that is neither the platform class loader nor its ancestor; otherwise, loader
is the platform class loader. If this call results in a ClassNotFoundException
and the name of the passed ObjectStreamClass
instance is the Java language keyword for a primitive type or void, then the Class
object representing that primitive type or void will be returned (e.g., an ObjectStreamClass
with the name "int"
will be resolved to Integer.TYPE
). Otherwise, the ClassNotFoundException
will be thrown to the caller of this method.desc
- an instance of class ObjectStreamClass
Class
object corresponding to desc
IOException
- any of the usual Input/Output exceptions.ClassNotFoundException
- if class of a serialized object cannot be found.protected Class<?> resolveProxyClass(String[] interfaces) throws IOException, ClassNotFoundException
This method is called exactly once for each unique proxy class descriptor in the stream.
The corresponding method in ObjectOutputStream
is annotateProxyClass
. For a given subclass of ObjectInputStream
that overrides this method, the annotateProxyClass
method in the corresponding subclass of ObjectOutputStream
must write any data or objects read by this method.
The default implementation of this method in ObjectInputStream
returns the result of calling Proxy.getProxyClass
with the list of Class
objects for the interfaces that are named in the interfaces
parameter. The Class
object for each interface name i
is the value returned by calling
Class.forName(i, false, loader)
loader
is the first class loader on the current thread's stack (starting from the currently executing method) that is neither the platform class loader nor its ancestor; otherwise, loader
is the platform class loader. Unless any of the resolved interfaces are non-public, this same value of loader
is also the class loader passed to Proxy.getProxyClass
; if non-public interfaces are present, their class loader is passed instead (if more than one non-public interface class loader is encountered, an IllegalAccessError
is thrown). If Proxy.getProxyClass
throws an IllegalArgumentException
, resolveProxyClass
will throw a ClassNotFoundException
containing the IllegalArgumentException
.interfaces
- the list of interface names that were deserialized in the proxy class descriptorIOException
- any exception thrown by the underlying InputStream
ClassNotFoundException
- if the proxy class or any of the named interfaces could not be foundprotected Object resolveObject(Object obj) throws IOException
This method is called after an object has been read but before it is returned from readObject. The default resolveObject method just returns the same object.
When a subclass is replacing objects it must ensure that the substituted object is compatible with every field where the reference will be stored. Objects whose type is not a subclass of the type of the field or array element abort the deserialization by raising an exception and the object is not be stored.
This method is called only once when each object is first encountered. All subsequent references to the object will be redirected to the new object.
obj
- object to be substitutedIOException
- Any of the usual Input/Output exceptions.protected boolean enableResolveObject(boolean enable) throws SecurityException
resolveObject(java.lang.Object)
method is called for every object being deserialized. If object replacement is currently not enabled, and enable
is true, and there is a security manager installed, this method first calls the security manager's checkPermission
method with the SerializablePermission("enableSubstitution")
permission to ensure that the caller is permitted to enable the stream to do replacement of objects read from the stream.
enable
- true for enabling use of resolveObject
for every object being deserializedSecurityException
- if a security manager exists and its checkPermission
method denies enabling the stream to do replacement of objects read from the stream.protected void readStreamHeader() throws IOException, StreamCorruptedException
IOException
- if there are I/O errors while reading from the underlying InputStream
StreamCorruptedException
- if control information in the stream is inconsistentprotected ObjectStreamClass readClassDescriptor() throws IOException, ClassNotFoundException
writeClassDescriptor
method). By default, this method reads class descriptors according to the format defined in the Object Serialization specification.IOException
- If an I/O error has occurred.ClassNotFoundException
- If the Class of a serialized object used in the class descriptor representation cannot be foundpublic int read() throws IOException
read
in interface ObjectInput
read
in class InputStream
IOException
- if an I/O error occurs.public int read(byte[] buf, int off, int len) throws IOException
read
in interface ObjectInput
read
in class InputStream
buf
- the buffer into which the data is readoff
- the start offset in the destination array buf
len
- the maximum number of bytes read-1
if there is no more data because the end of the stream has been reached.NullPointerException
- if buf
is null
.IndexOutOfBoundsException
- if off
is negative, len
is negative, or len
is greater than buf.length - off
.IOException
- If an I/O error has occurred.public int available() throws IOException
available
in interface ObjectInput
available
in class InputStream
IOException
- if there are I/O errors while reading from the underlying InputStream
public void close() throws IOException
close
in interface AutoCloseable
close
in interface Closeable
close
in interface ObjectInput
close
in class InputStream
IOException
- if an I/O error occurs.public boolean readBoolean() throws IOException
readBoolean
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public byte readByte() throws IOException
readByte
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public int readUnsignedByte() throws IOException
readUnsignedByte
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public char readChar() throws IOException
readChar
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public short readShort() throws IOException
readShort
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public int readUnsignedShort() throws IOException
readUnsignedShort
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public int readInt() throws IOException
readInt
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public long readLong() throws IOException
readLong
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public float readFloat() throws IOException
readFloat
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public double readDouble() throws IOException
readDouble
in interface DataInput
EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public void readFully(byte[] buf) throws IOException
readFully
in interface DataInput
buf
- the buffer into which the data is readNullPointerException
- If buf
is null
.EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public void readFully(byte[] buf, int off, int len) throws IOException
readFully
in interface DataInput
buf
- the buffer into which the data is readoff
- the start offset into the data array buf
len
- the maximum number of bytes to readNullPointerException
- If buf
is null
.IndexOutOfBoundsException
- If off
is negative, len
is negative, or len
is greater than buf.length - off
.EOFException
- If end of file is reached.IOException
- If other I/O error has occurred.public int skipBytes(int len) throws IOException
skipBytes
in interface DataInput
len
- the number of bytes to be skippedIOException
- If an I/O error has occurred.@Deprecated public String readLine() throws IOException
readLine
in interface DataInput
IOException
- if there are I/O errors while reading from the underlying InputStream
public String readUTF() throws IOException
readUTF
in interface DataInput
IOException
- if there are I/O errors while reading from the underlying InputStream
UTFDataFormatException
- if read bytes do not represent a valid modified UTF-8 encoding of a stringpublic final ObjectInputFilter getObjectInputFilter()
JVM-wide filter factory
either by the constructor or the most recent invocation of setObjectInputFilter
.public final void setObjectInputFilter(ObjectInputFilter filter)
filter
parameter. The current filter was set in the ObjectInputStream constructors by invoking the JVM-wide filter factory and may be null
. setObjectInputFilter(ObjectInputFilter) This method} can be called once and only once before reading any objects from the stream; for example, by calling readObject()
or readUnshared()
. It is not permitted to replace a non-null
filter with a null
filter. If the current filter is non-null
, the value returned from the filter factory must be non-null
.
The filter's checkInput
method is called for each class and reference in the stream. The filter can check any or all of the class, the array length, the number of references, the depth of the graph, and the size of the input stream. The depth is the number of nested readObject calls starting with the reading of the root of the graph being deserialized and the current object being deserialized. The number of references is the cumulative number of objects and references to objects already read from the stream including the current object being read. The filter is invoked only when reading objects from the stream and not for primitives.
If the filter returns Status.REJECTED
, null
or throws a RuntimeException
, the active readObject
or readUnshared
throws InvalidClassException
, otherwise deserialization continues uninterrupted.
null
, is invoked during readObject
and readUnshared
for each object (regular or class) in the stream. Strings are treated as primitives and do not invoke the filter. The filter is called for: null
, arrayLength is -1), null
, arrayLength is -1), null
, arrayLength is -1), readResolve
method is filtered using the replacement object's class, if not null
, and if it is an array, the arrayLength, otherwise -1, resolveObject
is filtered using the replacement object's class, if not null
, and if it is an array, the arrayLength, otherwise -1. checkInput
method is invoked it is given access to the current class, the array length, the current number of references already read from the stream, the depth of nested calls to readObject
or readUnshared
, and the implementation dependent number of bytes consumed from the input stream. Each call to readObject
or readUnshared
increases the depth by 1 before reading an object and decreases by 1 before returning normally or exceptionally. The depth starts at 1
and increases for each nested object and decrements when each nested call returns. The count of references in the stream starts at 1
and is increased before reading an object.
filter
- the filter, may be nullSecurityException
- if there is security manager and the SerializablePermission("serialFilter")
is not grantedIllegalStateException
- if an object has been read, if the filter factory returns null
when the current filter is non-null, or if the filter has already been set.
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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/ObjectInputStream.html