Java

How to find out which JAXB implementation is used in your code

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When using WildFly or JBoss EAP, the JAXB implementation is defined by the following specification in module.xml: <module name=”javax.xml.bind.api” xmlns=”urn:jboss:module:1.7″> <dependencies> <module name=”javax.activation.api” export=”true”/> <module name=”javax.xml.stream.api”/> <module name=”com.sun.xml.bind” services=”import”/> <module name=”javax.api”/> </dependencies> <resources> <resource-root path=”jboss-jaxb-api_2.3_spec-1.0.1.Final-redhat-1.jar”/> </resources> </module>  In order to check the actual JAXB implementation, you can just create a new Instance of JAXBContext and … Read more

How to solve java.lang.OutOfMemoryError: GC overhead limit exceeded

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The error “java.lang.OutOfMemoryError: GC overhead limit exceeded” is fairly common for old JDK (mostly JDK 1.6 and JDK 1.7) . Let’see how to solve it. According to the JDK Troubleshooting guide, the “java.lang.OutOfMemoryError: GC overhead” limit exceeded indicates that the garbage collector is running all the time and Java program is making very slow progress. … Read more

Getting started with Java-based Machine Learning Libraries

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There are over 70 Java-based open source machine learning projects listed on the MLOSS.org website, and probably many more unlisted projects live at university servers, GitHub, or Bitbucket. In this article, we will review the major libraries and platforms, the kind of problems they can solve, the algorithms they support, and the kind of data they can work with. … Read more

How to kill a Java process from Java

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Today I had to write a quick code to find out which Java process is using a Port and eventually killed it. You can use it as template in case you have to manage OS process in Linux from Java code: import java.io.BufferedReader; import java.io.InputStreamReader; public class Execute { public static void main(String[] args) { … Read more

How to check if a port is open in Java

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Here is a minimalist Java code which can be used to test if a port is available. In this example, we are checking for port 8080 by opening a new Socket to that port. We allow up to 10 retries if the port has been found already used. Enjoy it! import java.io.IOException; import java.net.Socket; public … Read more

Getting the process id (PID) programmatically in Java 9

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Java 9 features a simple an portable way to retrieve the process id of the Java Virtual Machine. This can be done through the ProcessHandle which identifies and provides control of native processes. Each individual process can be monitored for liveness, list its children, get information about the process or destroy it. By comparison, Process … Read more