test/script/trusted/JDK-8020809.js

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * under the terms of the GNU General Public License version 2 only, as
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 */

/**
 * JDK-8020809: Java adapter should not allow overriding of caller sensitive methods
 *
 * @test
 * @run
 */

// This test runs as trusted as we need the
// "enableContextClassLoaderOverride" runtime permission.

var T = Java.extend(java.lang.Thread, {
    getContextClassLoader: function() {
        // Since getContextClassLoader is caller sensitive, this won't
        // actually act as an override; it will be ignored. If we could
        // invoke it, it would be an error.
        throw new Error()
    }
})

// Retrieve the context ClassLoader on our Thread adapter, ensure the
// method was not, in fact, overridden.
var cl = (new T()).contextClassLoader

print("cl is class loader: "  + (cl instanceof java.lang.ClassLoader))