Package org.elasticsearch.jdk

Class JarHell

java.lang.Object

org.elasticsearch.jdk.JarHell

public class JarHell
extends 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(Consumer<String> output)	Checks the current classpath for duplicate classes
static void	checkJarHell(Set<URL> urls, Consumer<String> output)	Checks the set of URLs for duplicate classes
static void	checkJavaVersion(String resource, String targetVersion)	Checks that the java specification version targetVersion required by resource is compatible with the current installation.
static void	checkVersionFormat(String targetVersion)
static void	main(String[] args)	Simple driver class, can be used eg.
static Set<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(String[] args)
                 throws Exception

Simple driver class, can be used eg. from builds. Returns non-zero on jar-hell

Throws:

Exception

checkJarHell

public static void checkJarHell(Consumer<String> output)
                         throws IOException,
URISyntaxException

Checks the current classpath for duplicate classes

Parameters:

output - A String Consumer to which debug output will be sent

Throws:

IllegalStateException - if jar hell was found

IOException

URISyntaxException

parseClassPath

public static Set<URL> parseClassPath()

Parses the classpath into an array of URLs

Returns:

array of URLs

Throws:

IllegalStateException - if the classpath contains empty elements

checkJarHell

public static void checkJarHell(Set<URL> urls,
 Consumer<String> output)
                         throws URISyntaxException,
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:

IllegalStateException - if jar hell was found

URISyntaxException

IOException

checkVersionFormat

public static void checkVersionFormat(String targetVersion)

checkJavaVersion

public static void checkJavaVersion(String resource,
 String targetVersion)

Checks that the java specification version targetVersion required by resource is compatible with the current installation.