Thorsten
Thanks very much for the micro. I have update it to
https://bugs.openjdk.java.net/browse/JDK-8173594
Thanks
Jenny
On 2/28/2017 4:45 AM, Thorsten Goetzke wrote:
Hello,
Back in January i posted about Unreachable Objects not claimed by the
gc, i am finally able to produce a micro, see below. When I run the
class below using -Xmx4g and take a memory snaphsot (hprof or yourkit,
doesnt matter), I will see 2 LeakImpl Objects. These Objects have no
reported path to root, yet they won't be collected. If i lower the
heap space to -Xmx2g the Application throws
java.lang.OutOfMemoryError: Java heap space.
@Jenny Zhang should I create a new bugreport, or will you take care of
this?
Best Regards,
Thorsten Goetzke
package de.frei.demo;
import jdk.nashorn.api.scripting.NashornScriptEngine;
import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
import javax.script.CompiledScript;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import java.util.function.Function;
public final class LeakDemo {
private static NashornScriptEngine ENGINE =
getNashornScriptEngine();
private static CompiledScript SCRIPT;
public static void main(String[] args) throws Exception {
simulateLoad();
simulateLoad();
System.gc();
Thread.sleep(1000000);
}
private static void simulateLoad() throws ScriptException {
final CompiledScript compiledScript = getCompiledScript(ENGINE);
compiledScript.eval(new SimplestBindings(new LeakImpl()));
}
private static NashornScriptEngine getNashornScriptEngine() {
final NashornScriptEngineFactory factory = new
NashornScriptEngineFactory();
final NashornScriptEngine scriptEngine = (NashornScriptEngine)
factory.getScriptEngine();
return scriptEngine;
}
private static CompiledScript getCompiledScript(final
NashornScriptEngine scriptEngine) throws ScriptException {
if (SCRIPT == null) {
SCRIPT = scriptEngine.compile(" var pivot =
getItem(\"pivot\");");
}
return SCRIPT;
}
public interface Leak {
LiveItem getItem(String id);
}
public static final class LeakImpl implements Leak {
private final byte[] payload = new byte[1024 * 1024 * 1024];
@Override
public LiveItem getItem(final String id) {
return new LiveItem() {
};
}
}
public interface LiveItem {
}
public static final class SimplestBindings extends SimpleBindings {
public SimplestBindings(Leak leak) {
put("getItem",(Function< String, LiveItem>) leak::getItem);
}
}
}
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