[jboss-jira] [JBoss JIRA] (DROOLS-1193) MemoryUtil's static constructor call to ManagementFactory.getMemoryPoolMXBeans() fails on Google App Engine
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https://issues.jboss.org/browse/DROOLS-1193?page=com.atlassian.jira.plugi...
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Geoffrey De Smet edited comment on DROOLS-1193 at 5/26/16 10:23 AM:
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After discussion we saw 3 alternatives:
* A) Disable the feature (such as jitting constraints) if BeanManager isn't available
on JDK 7 or lower - Accepted
* B) Pessmistically guess the permGenspace value - Rejected because it's
unreliabe/unstable. It's also impossible to ask later on how much is left.
* C) Allow enabling/disabling each feature individually through configuration - Rejected
because it's inferior to A): too much painfully hoops for a user to jump through.
How do we detect GAE (and Android etc) best? Still under debate:
http://stackoverflow.com/questions/37463518/how-to-detect-google-app-engi...
was (Author: ge0ffrey):
After discussion we saw 3 alternative:
* A) Disable the feature (such as jitting constraints) if BeanManager isn't available
on JDK 7 or lower - Accepted
* B) Pessmistically guess the permGenspace value - Rejected because it's
unreliabe/unstable. It's also impossible to ask later on how much is left.
* C) Allow enabling/disabling each feature individually through configuration - Rejected
because it's inferior to A): too much painfully hoops for a user to jump through.
How do we detect GAE (and Android etc) best? Still under debate:
http://stackoverflow.com/questions/37463518/how-to-detect-google-app-engi...
MemoryUtil's static constructor call to
ManagementFactory.getMemoryPoolMXBeans() fails on Google App Engine
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Key: DROOLS-1193
URL: https://issues.jboss.org/browse/DROOLS-1193
Project: Drools
Issue Type: Bug
Components: core engine
Affects Versions: 6.4.0.Final
Reporter: Geoffrey De Smet
Assignee: Mario Fusco
{code}
[INFO] java.lang.NoClassDefFoundError: java.lang.management.ManagementFactory is a
restricted class. Please see the Google App Engine developer's guide for more
details.
[INFO] at
com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:52)
[INFO] at org.drools.core.util.MemoryUtil.<clinit>(MemoryUtil.java:33)
[INFO] at java.lang.Class.forName0(Native Method)
[INFO] at java.lang.Class.forName(Class.java:195)
[INFO] at
com.google.appengine.tools.development.agent.runtime.RuntimeHelper.checkRestricted(RuntimeHelper.java:70)
[INFO] at
com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:65)
[INFO] at
org.drools.core.RuleBaseConfiguration.setPermGenThreshold(RuleBaseConfiguration.java:583)
[INFO] at
org.drools.core.RuleBaseConfiguration.init(RuleBaseConfiguration.java:451)
[INFO] at
org.drools.core.RuleBaseConfiguration.init(RuleBaseConfiguration.java:429)
[INFO] at
org.drools.core.RuleBaseConfiguration.<init>(RuleBaseConfiguration.java:278)
[INFO] at
org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieBaseConfiguration(KieServicesImpl.java:185)
{code}
the problem is in this code:
{code}
static {
if (!hasPermGen() || ClassUtils.isAndroid()) { // hasPermGen is true because GAE
doesn't support java 8 yet
permGenStats = new DummyMemoryStats();
} else {
MemoryPoolMXBean permGenBean = null;
for (MemoryPoolMXBean mx : ManagementFactory.getMemoryPoolMXBeans()) { //
<=== EXCEPTION
if (mx.getName() != null &&
mx.getName().contains("Perm")) {
permGenBean = mx;
break;
}
}
permGenStats = new MBeanMemoryStats(permGenBean);
}
}
{code}
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