Classloader swapping in Java

ClassLoaderSwapper.java

public abstract class ClassLoaderSwapper {

    public void doWithClassLoader(ClassLoader classLoader) {
        ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
        Thread.currentThread().setContextClassLoader(classLoader);
        try {
            doInternal();
        }
        finally {
            Thread.currentThread().setContextClassLoader(oldClassLoader);
        }
    }

    protected abstract void doInternal();

}

ClassLoaderSwapperClient.java

public class ClassLoaderSwapperClient {

    public void doSomething() {
        UsageClassLoaderSwapper swapper = new UsageClassLoaderSwapper();
        ClassLoader portalClassLoader = PortalClassLoaderUtil.getPortalClassLoader();
        swapper.doWithClassLoader(portalClassLoader);
    }

}

UsageClassLoaderSwapper.java

public class UsageClassLoaderSwapper extends ClassLoaderSwapper {

    @Override
    protected void doInternal() {
        System.out.println("hi");
        System.out.println("bye");
    }

}