How to open a .war (web archive) or .jar (java archive) files - Digizol6

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Wednesday, July 30, 2008

How to open a .war (web archive) or .jar (java archive) files

With Java we generate .JAR files to bundle a set of resources. For J2EE web applications, we generate .WAR (Web Archive) files for deployments. Both of these are ways of archiving a set of files.

Both these .jar or .war archives are in zip format. So there are plenty of ways to open those files to read the content. One way would be to use any tool that you use to open/extract a .zip file. Next will be to use the Jar command itself.

JAR Command
JAR (command) utility in Java can be used to open/extract these files as follows. Run following command from the folder where you need the content to be extracted by providing the path to the archive.

jar xf <path-to-file>

options:
x - extract the files
f - file to extract

jar xf myWebApp.war
jar xf myProject.jar

Related : Open and read a file inside a war file of a web application with Java

2 comments:

  1. So it's also in zip format? Why does Java uses .zip format?

    ReplyDelete
  2. this error was displayed when i try to start the tomcat server.......

    java.lang.ClassNotFoundException: org.springframework.core.SmartClassLoader
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1384)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1890)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:887)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1351)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1230)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at org.springframework.web.servlet.FrameworkServlet.class$(FrameworkServlet.java:105)
    at org.springframework.web.servlet.FrameworkServlet.(FrameworkServlet.java:105)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at java.lang.Class.newInstance0(Class.java:355)
    at java.lang.Class.newInstance(Class.java:308)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1116)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4149)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4458)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:984)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:907)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1211)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:741)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
    at org.apache.catalina.core.StandardService.start(StandardService.java:516)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:587)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:290)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:415)





    plz help me..............

    ReplyDelete

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