Package org.elasticsearch.bootstrap

Class JarHell

java.lang.Object
org.elasticsearch.bootstrap.JarHell
public class JarHell
extends java.lang.Object
Simple check for duplicate class files across the classpath.

This class checks for incompatibilities in the following ways:

  • Checks that class files are not duplicated across jars.
  • Checks any X-Compile-Target-JDK value in the jar manifest is compatible with current JRE
  • Checks any X-Compile-Elasticsearch-Version value in the jar manifest is compatible with the current ES

  • Method Summary

    Modifier and Type Method Description
    static void checkJarHell​(java.util.function.Consumer<java.lang.String> output)
    Checks the current classpath for duplicate classes
    static void checkJarHell​(java.util.Set<java.net.URL> urls, java.util.function.Consumer<java.lang.String> output)
    Checks the set of URLs for duplicate classes
    static void checkJavaVersion​(java.lang.String resource, java.lang.String targetVersion)
    Checks that the java specification version targetVersion required by resource is compatible with the current installation.
    static void checkVersionFormat​(java.lang.String targetVersion)  
    static void main​(java.lang.String[] args)
    Simple driver class, can be used eg.
    static java.util.Set<java.net.URL> parseClassPath()
    Parses the classpath into an array of URLs

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • main

      public static void main​(java.lang.String[] args) throws java.lang.Exception
      Simple driver class, can be used eg. from builds. Returns non-zero on jar-hell
      Throws:
      java.lang.Exception

    • checkJarHell

      public static void checkJarHell​(java.util.function.Consumer<java.lang.String> output) throws java.io.IOException, java.net.URISyntaxException
      Checks the current classpath for duplicate classes
      Parameters:
      output - A String Consumer to which debug output will be sent
      Throws:
      java.lang.IllegalStateException - if jar hell was found
      java.io.IOException
      java.net.URISyntaxException

    • parseClassPath

      public static java.util.Set<java.net.URL> parseClassPath()
      Parses the classpath into an array of URLs
      Returns:
      array of URLs
      Throws:
      java.lang.IllegalStateException - if the classpath contains empty elements

    • checkJarHell

      public static void checkJarHell​(java.util.Set<java.net.URL> urls, java.util.function.Consumer<java.lang.String> output) throws java.net.URISyntaxException, java.io.IOException
      Checks the set of URLs for duplicate classes
      Parameters:
      urls - A set of URLs from the classpath to be checked for conflicting jars
      output - A String Consumer to which debug output will be sent
      Throws:
      java.lang.IllegalStateException - if jar hell was found
      java.net.URISyntaxException
      java.io.IOException

    • checkVersionFormat

      public static void checkVersionFormat​(java.lang.String targetVersion)

    • checkJavaVersion

      public static void checkJavaVersion​(java.lang.String resource, java.lang.String targetVersion)
      Checks that the java specification version targetVersion required by resource is compatible with the current installation.