Joe Au created HADOOP-10063:
-------------------------------
Summary: RunJar ClassLoader cached the class can't release
Key: HADOOP-10063
URL: https://issues.apache.org/jira/browse/HADOOP-10063
Project: Hadoop Common
Issue Type: Improvement
Components: util
Affects Versions: 2.2.0, 1.0.3
Reporter: Joe Au
At the end of method main()
{code:title=RunJar.java|borderStyle=solid}
ClassLoader loader =
new URLClassLoader(classPath.toArray(new URL[0]));
Thread.currentThread().setContextClassLoader(loader);
Class<?> mainClass = Class.forName(mainClassName, true, loader);
Method main = mainClass.getMethod("main", new Class[] {
Array.newInstance(String.class, 0).getClass()
});
String[] newArgs = Arrays.asList(args)
.subList(firstArg, args.length).toArray(new String[0]);
try {
main.invoke(null, new Object[] { newArgs });
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
{code}
The ClassLoader cached the class can't release.Because the development time
code will often changes, so will be very inconvenient.
Rewrite as follows:
{code:title=RunJar.java|borderStyle=solid}
ClassLoader prevCl =
Thread.currentThread().getContextClassLoader();
ClassLoader loader = new URLClassLoader(classPath.toArray(new
URL[0]), prevCl);
try {
Thread.currentThread().setContextClassLoader(loader);
Class<?> mainClass = Class.forName(mainClassName, true,
loader);
Method main = mainClass.getMethod("main", new Class[] {
Array
.newInstance(String.class,
0).getClass() });
String[] newArgs =
Arrays.asList(args).subList(firstArg, args.length)
.toArray(new String[0]);
main.invoke(null, new Object[] { newArgs });
} catch (InvocationTargetException e) {
throw e.getTargetException();
} finally {
// Restore
Thread.currentThread().setContextClassLoader(prevCl);
}
{code}
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