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https://issues.apache.org/jira/browse/HADOOP-10063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Joe Au updated HADOOP-10063:
----------------------------
Issue Type: Bug (was: Improvement)
> 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: Bug
> Components: util
> Affects Versions: 1.0.3, 2.2.0
> 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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