Metaspace memory concumption issues of Java 8 applications deployed on Wildfly 8.2.1
Issue description
I noticed that each deployment of one of our Java8 application on Wildfly 8.2.1 uses approximately 30-40 MBs from Metaspace memory pool. That is fine, but the thing is that once I am redeploying the same app the Metaspace memory usage is being increased by the same 30-40 MBs whereas the old already allocated memory is not being released.
I would not even notice it but the thing is that we have ~20 applications and from time to time I need to redeploy up to 10 of them at the same time. That in turn results in a scary picture.
Basically what is shown are the 2 redeployments of ~10 applications.
I'm not sure why GC cannot release the memory allocated to the old classes. This server has in total 16GB physical memory so I can redeploy all apps up to 20-40 times and that is it. App server will reach the limit and will stop respond to any commands.
So I would be very thankful if someone could help me to understand what the actual issue could be:
- Is it a Java8 issue? (jdk 1.8.0_40-b26)
- Is it a Wildfly 8.2.1 issue?
- Or is the answer as simple as possible that the cause is my code base? If so, then could you please guide me what could be the actual reason?
Some more details related to my code base
1) Together with Wildfly I use 2 standalone HornetQ servers, each application uses ~5 channels with at least 5 concurrent consumers on each. Which in turn results in at least 25 threads for each app and at least 25*20 = 500 threads in total.
2) For all low-level JMS operations I use Spring JMS.
WildFly 10.0.0.Final "java.lang.OutOfMemoryError: Metaspace" occurs and will be fixed. Refer to follow Agile Board of Wildfly
- Java Applet allowed for Javac or other jar access?
- Adding keys to a HashMap from two different Set sources, using two different functions, using a stream
- Spring Cloud Gateway tests fail after upgrade to Spring Boot 3.4.0 (specifically spring-web 6.2.0)
- Oracle ojdbc8 12.2.0.1 Forbidden by Maven
- Getting rid of Eclipse Junit 4 runtime configuration extraneous VM arguments
- What's the best way to define the words "class" and "object" to someone who hasn't used them?
- Java event propagation stopped
- Learn JavaFX without IDE
- No primary or default constructor found for interface org.springframework.data.domain.Pageable
- How to copy Java Collections list
- There is no OpenGL ES context current in the current thread - LWJGL using OpenGL ES 3.0
- java replace German umlauts
- Why is the operator precedence not followed here?
- How is the return value of a method ignored in Java?
- Why HTTP method PUT should be idempotent and not the POST in implementation RestFul service?
- Gradle: Override transitive dependency by version classifier
- Why does Runtime.maxMemory() change its value on separate calls?
- How to hide/ignore a field in swagger docs but set via spec/jolt file in spring-boot?
- Flyway JDBC migration connection trouble
- Best way to define Java constant dates
- Mocking of Private static variable using jmockit
- Impossible to make a cached thread pool with a size limit?
- Postgresql Procedure not getting called from JDBC
- How to convert an Iterator to a Stream?
- Java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException
- java: variable employeeService not initialized in the default constructor
- Split Unsigned 32-bit Integer into Two 16-bit numbers that can be rebuilt
- Why does a compile-time error appears for this one involving Generics?
- JDK 1.8 not supported by vs code?
- How to convert milliseconds into days?