org.springframework.remoting.rmi
Class CodebaseAwareObjectInputStream

java.lang.Object
  java.io.InputStream
      java.io.ObjectInputStream
          org.springframework.core.ConfigurableObjectInputStream
              org.springframework.remoting.rmi.CodebaseAwareObjectInputStream

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.io.ObjectInput, java.io.ObjectStreamConstants

public class CodebaseAwareObjectInputStream
extends ConfigurableObjectInputStream

Special ObjectInputStream subclass that falls back to a specified codebase to load classes from if not found locally. In contrast to standard RMI conventions for dynamic class download, it is the client that determines the codebase URL here, rather than the "java.rmi.server.codebase" system property on the server.

Uses the JDK's RMIClassLoader to load classes from the specified codebase. The codebase can consist of multiple URLs, separated by spaces. Note that RMIClassLoader requires a SecurityManager to be set, like when using dynamic class download with standard RMI! (See the RMI documentation for details.)

Despite residing in the RMI package, this class is not used for RmiClientInterceptor, which uses the standard RMI infrastructure instead and thus is only able to rely on RMI's standard dynamic class download via "java.rmi.server.codebase". CodebaseAwareObjectInputStream is used by HttpInvokerClientInterceptor (see the "codebaseUrl" property there).

Thanks to Lionel Mestre for suggesting the option and providing a prototype!

Since:

1.1.3

Author:

Juergen Hoeller

See Also:

RMIClassLoader, RemoteInvocationSerializingExporter.createObjectInputStream(java.io.InputStream), HttpInvokerClientInterceptor.setCodebaseUrl(java.lang.String)

Nested Class Summary

Nested classes/interfaces inherited from class java.io.ObjectInputStream

java.io.ObjectInputStream.GetField

Field Summary

private java.lang.String

codebaseUrl

Fields inherited from interface java.io.ObjectStreamConstants

baseWireHandle, PROTOCOL_VERSION_1, PROTOCOL_VERSION_2, SC_BLOCK_DATA, SC_ENUM, SC_EXTERNALIZABLE, SC_SERIALIZABLE, SC_WRITE_METHOD, 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

Constructor Summary

CodebaseAwareObjectInputStream(java.io.InputStream in, java.lang.ClassLoader classLoader, boolean acceptProxyClasses)
Create a new CodebaseAwareObjectInputStream for the given InputStream and codebase.

CodebaseAwareObjectInputStream(java.io.InputStream in, java.lang.ClassLoader classLoader, java.lang.String codebaseUrl)
Create a new CodebaseAwareObjectInputStream for the given InputStream and codebase.

CodebaseAwareObjectInputStream(java.io.InputStream in, java.lang.String codebaseUrl)
Create a new CodebaseAwareObjectInputStream for the given InputStream and codebase.

Method Summary

protected java.lang.ClassLoader	getFallbackClassLoader() Return the fallback ClassLoader to use when no ClassLoader was specified and ObjectInputStream's own default ClassLoader failed.
protected java.lang.Class	resolveFallbackIfPossible(java.lang.String className, java.lang.ClassNotFoundException ex) Resolve the given class name against a fallback class loader.

Methods inherited from class org.springframework.core.ConfigurableObjectInputStream

resolveClass, resolveProxyClass

Methods inherited from class java.io.ObjectInputStream

available, close, defaultReadObject, enableResolveObject, read, read, readBoolean, readByte, readChar, readClassDescriptor, readDouble, readFields, readFloat, readFully, readFully, readInt, readLine, readLong, readObject, readObjectOverride, readShort, readStreamHeader, readUnshared, readUnsignedByte, readUnsignedShort, readUTF, registerValidation, resolveObject, skipBytes

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.io.ObjectInput

read, skip

Field Detail

codebaseUrl

private final java.lang.String codebaseUrl

Constructor Detail

CodebaseAwareObjectInputStream

public CodebaseAwareObjectInputStream(java.io.InputStream in,
                                      java.lang.String codebaseUrl)
                               throws java.io.IOException

Create a new CodebaseAwareObjectInputStream for the given InputStream and codebase.

Parameters:

in - the InputStream to read from

codebaseUrl - the codebase URL to load classes from if not found locally (can consist of multiple URLs, separated by spaces)

Throws:

java.io.IOException

See Also:

ObjectInputStream.ObjectInputStream(java.io.InputStream)

CodebaseAwareObjectInputStream

public CodebaseAwareObjectInputStream(java.io.InputStream in,
                                      java.lang.ClassLoader classLoader,
                                      java.lang.String codebaseUrl)
                               throws java.io.IOException

Create a new CodebaseAwareObjectInputStream for the given InputStream and codebase.

Parameters:

in - the InputStream to read from

classLoader - the ClassLoader to use for loading local classes (may be null to indicate RMI's default ClassLoader)

codebaseUrl - the codebase URL to load classes from if not found locally (can consist of multiple URLs, separated by spaces)

Throws:

java.io.IOException

See Also:

ObjectInputStream.ObjectInputStream(java.io.InputStream)

CodebaseAwareObjectInputStream

public CodebaseAwareObjectInputStream(java.io.InputStream in,
                                      java.lang.ClassLoader classLoader,
                                      boolean acceptProxyClasses)
                               throws java.io.IOException

Create a new CodebaseAwareObjectInputStream for the given InputStream and codebase.

Parameters:

in - the InputStream to read from

classLoader - the ClassLoader to use for loading local classes (may be null to indicate RMI's default ClassLoader)

acceptProxyClasses - whether to accept deserialization of proxy classes (may be deactivated as a security measure)

Throws:

java.io.IOException

See Also:

ObjectInputStream.ObjectInputStream(java.io.InputStream)

Method Detail

resolveFallbackIfPossible

protected java.lang.Class resolveFallbackIfPossible(java.lang.String className,
                                                    java.lang.ClassNotFoundException ex)
                                             throws java.io.IOException,
                                                    java.lang.ClassNotFoundException

Description copied from class: ConfigurableObjectInputStream

Resolve the given class name against a fallback class loader.

The default implementation simply rethrows the original exception, since there is no fallback available.

Overrides:

resolveFallbackIfPossible in class ConfigurableObjectInputStream

Parameters:

className - the class name to resolve

ex - the original exception thrown when attempting to load the class

Returns:

the newly resolved class (never null)

Throws:

java.io.IOException

java.lang.ClassNotFoundException

getFallbackClassLoader

protected java.lang.ClassLoader getFallbackClassLoader()
                                                throws java.io.IOException

Description copied from class: ConfigurableObjectInputStream

Return the fallback ClassLoader to use when no ClassLoader was specified and ObjectInputStream's own default ClassLoader failed.

The default implementation simply returns null.

Overrides:

getFallbackClassLoader in class ConfigurableObjectInputStream

Throws:

java.io.IOException