com.hazelcast.internal.util.JavaVm Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.internal.util;
import java.util.Properties;
/**
* Utility for checking runtime Java VM.
*
*/
public enum JavaVm {
UNKNOWN,
HOTSPOT,
OPENJ9;
public static final JavaVm CURRENT_VM = detectCurrentVM();
private static JavaVm detectCurrentVM() {
Properties properties = System.getProperties();
return parse(properties);
}
static JavaVm parse(Properties properties) {
String vmName = properties.getProperty("java.vm.name");
if (vmName == null) {
return UNKNOWN;
}
// Oracle JDK 'java.vm.name': Java HotSpot(TM) 64-Bit Server VM
// Oracle JDK 'sun.management.compiler': HotSpot 64-Bit Tiered Compilers
if (vmName.contains("HotSpot")) {
return HOTSPOT;
}
// Eclipse OpenJ9 'java.vm.name': Eclipse OpenJ9 VM
if (vmName.contains("OpenJ9")) {
return OPENJ9;
}
String prop = properties.getProperty("sun.management.compiler");
if (prop == null) {
return UNKNOWN;
}
// HotSpot based OpenJDK builds 'java.vm.name': OpenJDK 64-Bit Server VM.
// HotSpot based OpenJDK builds 'sun.management.compiler': HotSpot 64-Bit Tiered Compilers
if (prop.contains("HotSpot")) {
return HOTSPOT;
}
return UNKNOWN;
}
}