org.apache.flink.runtime.util

Class ClassLoaderUtil

java.lang.Object

org.apache.flink.runtime.util.ClassLoaderUtil

public final class ClassLoaderUtil
extends Object

Utilities for information with respect to class loaders, specifically class loaders for the dynamic loading of user defined classes.

Method Summary

Modifier and Type	Method and Description
static String	getUserCodeClassLoaderInfo(ClassLoader loader) Gets information about URL class loaders.
static boolean	validateClassLoadable(ClassNotFoundException cnfe, ClassLoader cl) Checks, whether the class that was not found in the given exception, can be resolved through the given class loader.

Methods inherited from class java.lang.Object

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

Method Detail

getUserCodeClassLoaderInfo

public static String getUserCodeClassLoaderInfo(ClassLoader loader)

Gets information about URL class loaders. The returned info string contains all URLs of the class loader. For file URLs, it contains in addition whether the referenced file exists, is a valid JAR file, or is a directory.

NOTE: This method makes a best effort to provide information about the classloader, and never throws an exception.

NOTE: Passing ClassLoader.getSystemClassLoader() on Java 9+ will not return anything interesting.

Parameters:

loader - The classloader to get the info string for.

Returns:

The classloader information string.

validateClassLoadable

public static boolean validateClassLoadable(ClassNotFoundException cnfe,
                                            ClassLoader cl)

Checks, whether the class that was not found in the given exception, can be resolved through the given class loader.

Parameters:

cnfe - The ClassNotFoundException that defines the name of the class.

cl - The class loader to use for the class resolution.

Returns:

True, if the class can be resolved with the given class loader, false if not.