org.springframework.remoting.rmi
Class CodebaseAwareObjectInputStream

java.lang.Object
  

java.io.InputStream
      java.io.ObjectInputStream
          org.springframework.remoting.rmi.CodebaseAwareObjectInputStream

All Implemented Interfaces:

Closeable, DataInput, ObjectInput, ObjectStreamConstants

public class CodebaseAwareObjectInputStream
extends ObjectInputStream

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, HttpInvokerClientInterceptor.setCodebaseUrl(java.lang.String)

Nested Class Summary

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

ObjectInputStream.GetField

Field Summary

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

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

Method Summary

protected Class	resolveClass(ObjectStreamClass classDesc) Overridden version delegates to super class first, falling back to the specified codebase if not found locally.
protected Class	resolveProxyClass(String[] interfaces) Overridden version delegates to super class first, falling back to the specified codebase if not found locally.

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

Constructor Detail

CodebaseAwareObjectInputStream

public CodebaseAwareObjectInputStream(InputStream in,
                                      String codebaseUrl)
                               throws 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:

IOException

See Also:

ObjectInputStream.ObjectInputStream(java.io.InputStream)

CodebaseAwareObjectInputStream

public CodebaseAwareObjectInputStream(InputStream in,
                                      ClassLoader classLoader,
                                      String codebaseUrl)
                               throws 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:

IOException

See Also:

ObjectInputStream.ObjectInputStream(java.io.InputStream)

Method Detail

resolveClass

protected Class resolveClass(ObjectStreamClass classDesc)
                      throws IOException,
                             ClassNotFoundException

Overridden version delegates to super class first, falling back to the specified codebase if not found locally.

Overrides:

resolveClass in class ObjectInputStream

Throws:

IOException

ClassNotFoundException

resolveProxyClass

protected Class resolveProxyClass(String[] interfaces)
                           throws IOException,
                                  ClassNotFoundException

Overridden version delegates to super class first, falling back to the specified codebase if not found locally.

Overrides:

resolveProxyClass in class ObjectInputStream

Throws:

IOException

ClassNotFoundException