JAR Searcher Developer Tool Often, Java Developers — Especially Those Working on Large Java EE Code — Realize that they are Facing Multiple Classpath Issues. by Join the DZone community and get the full member experience.Join For Free As a Java/J2EE developer, I know that the most commonly faced issue in development, which has also been reported as the primary reason for developers losing hair — missing classpath files or not being able to trace a JAR which contains the file — when you know you have all JARs that could possibly exist in this world on your local file system.