Encountering a java.lang.OutOfMemoryError can be frustrating, but we can take several practical steps to prevent it. In this article, we explain what causes this error, provide real world examples, and discuss effective techniques to manage memory in our Java applications. Table of contents Understanding java.lang.OutOfMemoryError Common Causes and Prevention Techniques 1. Optimize Heap Size 2. …
When we compile our Java programs, each generated .class file carries a major version that indicates which Java version was used during compilation. For example, if we compile our code using Java 21 (major version 65), and then run the class file on an environment with an older Java version, we will encounter the error: …
A Java project builds with Maven and runs on IntelliJ IDE but hits the following error message, and the IntelliJ IDE can’t compile the project. java: warning: source release 17 requires target release 17 1. Solution The above warning message tells you the Java project needs to compile and run with Java 17, but we …
When we compile our Java programs, each resulting .class file contains a major version number. For example, if we compile our code with Java 17 (major version 61), and then try to run the class file on Java 16 or earlier, we will encounter the error: Unsupported class file major version 61. This situation often …
A simple code snippet to simulate the java.lang.OutOfMemoryError: Java heap space
Using Jersey 3x + Jetty to develop endpoints, but hits the jakarta.activation.DataSource warning during application startup? Terminal SLF4J: No SLF4J providers were found. SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#noProviders for further details. May 27, 2021 10:09:48 AM org.glassfish.jersey.message.internal.MessagingBinders$EnabledProvidersBinder bindToBinder WARNING: A class jakarta.activation.DataSource for a default provider MessageBodyWriter<jakarta.activation.DataSource> was not found. …
Using Jersey 3x + Jetty to develop endpoints, but hits the following error during application startup. Terminal Exception in thread "main" java.lang.NoClassDefFoundError: jakarta/servlet/ServletInputStream at org.glassfish.jersey.jetty.JettyHttpContainerProvider.createContainer(JettyHttpContainerProvider.java:43) at org.glassfish.jersey.server.ContainerFactory.createContainer(ContainerFactory.java:58) at org.glassfish.jersey.jetty.JettyHttpContainerFactory.createServer(JettyHttpContainerFactory.java:110) at com.mkyong.MainApp.startServer(MainApp.java:22) at com.mkyong.MainApp.main(MainApp.java:32) Caused by: java.lang.ClassNotFoundException: jakarta.servlet.ServletInputStream at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) … 5 more 1. jakarta/servlet/* and Servlet API 5.0 Since Servlet API …
Deployed a “war” file on Tomcat, and hits following error messages : Jul 17, 2014 7:59:55 PM org.apache.catalina.loader.WebappClassLoader validateJarFile INFO: validateJarFile(D:\apache-tomcat-7.0.53\webapps\hc\WEB-INF\lib\servlet-api-2.5.jar) – jar not loaded. See Servlet Spec 3.0, section 10.7.2. Offending class: javax/servlet/Servlet.class Tools used : JDK1.7 Maven 3 Tomcat 7 1. Reason The Tomcat’s container comes with own version of servlet-api.jar, and the …
This article shows how to solve the java.lang.OutOfMemoryError: Java heap space in Eclipse IDE. Table of contents 1. Eclipse – OutOfMemoryError: Java heap space 2. Temporary fix – Increase the heap size 3. eclipse.ini 4. The solution, find the reason behind the heap size error. 5. References 1. Eclipse – OutOfMemoryError: Java heap space In …
