Debugger Which Tomcat Class Loader Is Being Used

Specify the script to be used to start the server. Our Bootstrap instance holds references to the following three class loaders.

Tomcat Source Code Analysis Tomcat Class Loader

If this checkbox is selected the default script is used.

. For light debugging set the system property orgapachejuliClassLoaderLogManagerdebugtrue. Normally application classes should NOT be placed here. Debugging server startup problems.

This flag indicates that Tomcat should use a JBoss unified class loader as the web application class loader. 3sharedLoader which loads classes that are common just across all the web. From the WEB-INFclasses directory inside your web application.

2catalinaLoader or serverLoader which loads classes that are used just by Tomcat. Thanks for your help with this Andreas I put a bunch of debug statements in various places and found the WebappClassLoader was being used consistently throughout. Then we move on to remotely debug the class loading sequence in which case I would be using Eclipse to do this.

You wrote the class loader being used hasnt got the same work-around that Tomcats class loader has. Tomcat has several class loaders based on where content is being loaded from - one for the main JVM classes BootStrap and System another for the Catalina classes one for server shared libraries Common and Shared and at least one for each web. Firstly we restart the Tomcat in debug mode with the following code.

Then we move on to remotely debug the class loading sequence in which case I would be using Eclipse to do this. Like many of the issues that trouble new Tomcat users this problem is usually quite easy to fix - so easy that its. I still dont understand what was happening in this SQLException case but I did end up finding my problems stem from the use of a singleton class in the legacy code I am using that.

Public class JspServletWrapper extends Object. It loads these class files from the following locations. Common This class loader contains additional classes that are made visible to both Tomcat internal classes and to all web applications.

And WebappClassLoaderBase line 1594 makes the difference for me. Like many server applications Tomcat 4 installs a variety of class loaders that is classes that implement javalangClassLoader to allow different portions of the container and the web applications running on the container to have access to different repositories of available classes and resources. ClassLoaderLogManager Apache Tomcat 9058 API Documentation javalangObject.

For other classes my own classes there are different classloaders. But Ive looked under the debugger and in fact the same classloader is being used for the DigestFactory class in both webapps. When using redisson-tomcat to provide a SessionManager for our tomcat installation we expect the classloader used to instantiate objects should be the current thread classloader regardless of which Codec is being used.

GetResource returns the path of an object based on the base class path of the ClassLoader being used. Public class ClassLoaderLogManager extends LogManager. Next in the hierarchy is Tomcats common class loader that loads those classes available to Tomcat and all Web applications.

Jasper will try get the Tomcat ServletContext attribute for its ServletContext class loader if that fails it uses the parent class loader. The default is true and this means that the classes available in the war inside of the WEB-INFclasses and WEB-INFjars are incorporated into the default shared class loader repository described in chapter 2. The Class SomeServiceImpl of class loader pathtotomcatlib does not implement the interface.

You should follow the logging configuration guide to set up logging of the orgapachecatalinaloader package for the DEBUG level. 1commonLoader which loads classes that are common across Tomcat as well as all the web applications. The default is true which means that the classes inside of the WEB-INFclasses and WEB-INFlib directories of the WAR file are incorporated into the default shared class loader repository described in Chapter 2 The.

This will contain log of all actions that Tomcat takes to load you webapp and all the JARs in your webapps WEB-INFlib directory and to load the classed requiredreferenced by you application. The locations searched by this class loader are defined by the commonloader property in CATALINA_BASEconfcatalinaproperties. Export JPDA_SUSPENDy TOMCAT_HOMEbincatalinash jpda.

Jetty or other open source Parent Last server is being used. A flag indicating if the class loader used by Tomcat as the web application class loader is a JBoss unified class loader. The default setting will search the following.

This mechanism is used to provide the functionality defined in the Servlet. Is WebappClassLoaderBase the Tomcat class loader. In this case opens the Default Startup Script dialog which shows the contents of the Startup script field.

In either case it must be a URLClassLoader. Use to switch between the settings for the run debug and code coverage modes. Understanding the Tomcat classpath - Common problems and how to fix them A common question that pops up on lots of Apache Tomcat user forums is how to configure Tomcats classpath to include this or that JAR file that is needed by a web application.

Export JPDA_SUSPENDy TOMCAT_HOMEbincatalinash jpda. This contradicts all tomcat documentation that I can find. Tomcats Common Class Loader.

Because WebappClassLoaderBase is used in my case. The JSP engine aka Jasper. This is to allow the right classloader Tomcat vs WAR classloader to create the objects which it.

The Loader element represents the web application class loader that will be used to load Java classes and resources for your web application. Debug Coverage. Also we need to set a class loader breakpoint on sunawtAppContext.

The servlet container is responsible for providing a URLClassLoader for the web application context Jasper is being used in. I found this by visual inspection. Such a class loader must follow the requirements of the Servlet Specification and load classes from the following locations.

Firstly we restart the Tomcat in debug mode with the following code. Using FSTCodec this worked as expected. Sorry for the confusion.

Also we need to set a class loader breakpoint on sunawtAppContext. Per classloader LogManager implementation.

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