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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Facing NoClassDefFoundError despite jar being in classpath (dynamic compilation)","articleBody":"In a tomcat server, at run time, I am reading java class files and compiling them dynamically using InMemoryJavaCompiler. \r\nCode Sample -\r\n```\r\nInMemoryJavaCompiler.newInstance()\r\n                       .useOptions(\"-parameters\", \r\n                          \"-classpath\", sb.toString(),  \r\n                          \"-Xlint:unchecked\")\r\n                       .compile(sourceCodeClassName,\r\n                          sourceCode.toString());\r\n```\r\nHere sb (Stringbuilder) indicates the jars read from WEB-INF/lib directory separated by a colon.\r\nThe code works in the following scenarios :\r\n    1. If the above compilation code is kept in a standalone class file \u0026 the relevant libraries are set in the classpath, the compilation from a bash script was successful.\r\n    2. I printed the jar files i.e. I printed sb value separately \u0026 took a copy of it. I manually ran javac -classpath \u003csourceCode.java\u003e in the terminal. The compilation was successful.\r\n\r\nThe code is not working in the following scenarios :\r\n\r\n   a. When the above code snippet is added as a stand alone program in IDE(Eclipse), I faced NoClassDefFound error for the interface which the sourceCode was implementing.\r\n\r\n   b. In Tomcat, the relevant jar is present in contextName/WEB-INF/lib/ and in addition to that the jar is added in -useOptions classpath. Even then, I am facing NoClassDefFound error for the the interface the sourceCode was implementing.\r\n\r\nNote : There are no duplicate copies of the jar or multiple versions of the jar present in the lib directory or the classpath value.","author":{"url":"https://github.com/LuPev","@type":"Person","name":"LuPev"},"datePublished":"2020-11-21T08:35:54.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/31/InMemoryJavaCompiler/issues/31"}