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• 0.23
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• ModuleHack.java

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org.gridkit.jvmtool.agent.ModuleHack Maven / Gradle / Ivy

package org.gridkit.jvmtool.agent;

import java.lang.instrument.Instrumentation;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class ModuleHack {

    public static void extendAccess(Instrumentation insrt) throws Exception {
        addExport(insrt, moduleOf(String.class), "jdk.internal.vm", moduleOf(ModuleHack.class));
    }

    @SuppressWarnings("unchecked")
    private static void addExport(Instrumentation insrt, Module from, String pn, Module to) {
        Map> extraExports = new HashMap>();
        extraExports.put(pn, Collections.singleton(to));
        insrt.redefineModule(from, Collections.EMPTY_SET, extraExports, Collections.EMPTY_MAP, Collections.EMPTY_SET, Collections.EMPTY_MAP);
    }

    private static Module moduleOf(Class type) throws Exception {
        return (Module)type.getClass().getMethod("getModule").invoke(type);
    }

}