org.apache.catalina.util

## Class CustomObjectInputStream

- java.lang.Object
- - java.io.InputStream
  - - java.io.ObjectInputStream
    - - org.apache.catalina.util.CustomObjectInputStream

- All Implemented Interfaces:
    Closeable, DataInput, ObjectInput, ObjectStreamConstants, AutoCloseable

      public final class CustomObjectInputStream
      extends ObjectInputStream

  Custom subclass of `ObjectInputStream` that loads from the class loader for this web application. This allows classes defined only with the web application to be found correctly.
  Author:
    Craig R. McClanahan, Bip Thelin

- - ### 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

    Constructors
    Constructor and Description
    `CustomObjectInputStream(InputStream stream, ClassLoader classLoader)` Construct a new instance of CustomObjectInputStream without any filtering of deserialized classes.
    `CustomObjectInputStream(InputStream stream, ClassLoader classLoader, Log log, Pattern allowedClassNamePattern, boolean warnOnFailure)` Construct a new instance of CustomObjectInputStream with filtering of deserialized classes.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Class<?>` | `resolveClass(ObjectStreamClass classDesc)` Load the local class equivalent of the specified stream class description, by using the class loader assigned to this Context.
    `protected Class<?>` | `resolveProxyClass(String[] interfaces)` Return a proxy class that implements the interfaces named in a proxy class descriptor.

    - ### 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

    - #### CustomObjectInputStream

          public CustomObjectInputStream(InputStream stream,
                                 ClassLoader classLoader)
                                  throws IOException

      Construct a new instance of CustomObjectInputStream without any filtering of deserialized classes.
      Parameters:
        `stream` - The input stream we will read from
        `classLoader` - The class loader used to instantiate objects
      Throws:
        `IOException` - if an input/output error occurs

    - #### CustomObjectInputStream

          public CustomObjectInputStream(InputStream stream,
                                 ClassLoader classLoader,
                                 Log log,
                                 Pattern allowedClassNamePattern,
                                 boolean warnOnFailure)
                                  throws IOException

      Construct a new instance of CustomObjectInputStream with filtering of deserialized classes.
      Parameters:
        `stream` - The input stream we will read from
        `classLoader` - The class loader used to instantiate objects
        `log` - The logger to use to report any issues. It may only be null if the filterMode does not require logging
        `allowedClassNamePattern` - The regular expression to use to filter deserialized classes. The fully qualified class name must match this pattern for deserialization to be allowed if filtering is enabled.
        `warnOnFailure` - Should any failures be logged?
      Throws:
        `IOException` - if an input/output error occurs

  - ### Method Detail

    - #### resolveClass

          public Class<?> resolveClass(ObjectStreamClass classDesc)
                                throws ClassNotFoundException,
                                       IOException

      Load the local class equivalent of the specified stream class description, by using the class loader assigned to this Context.
      Overrides:
        `resolveClass` in class `ObjectInputStream`
      Parameters:
        `classDesc` - Class description from the input stream
      Throws:
        `ClassNotFoundException` - if this class cannot be found
        `IOException` - if an input/output error occurs

    - #### resolveProxyClass

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

      Return a proxy class that implements the interfaces named in a proxy class descriptor. Do this using the class loader assigned to this Context.
      Overrides:
        `resolveProxyClass` in class `ObjectInputStream`
      Throws:
        `IOException`
        `ClassNotFoundException`

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