On 28/07/2019 07:26, Jmeter Tea wrote: > We are using Tomcat 8.5 *without any hot deploy*, > > I assume that classes are loaded to memory and for example if class change > in jar it will ignore (not hot deploy)
Correct. But, classes are only loaded as needed. Tomcat does not load every class in a JAR when the web application starts. And only classes are loaded into memory. Other resources may be read from the JAR as required and NOT cached. > But if we override a jar when application is running it overrides classes > (or removing it) Yes, for classes that haven't yet been loaded. > For example when I copy empty jar it throws ZipException for classes that > were in the jar: No, that is not what is happening here. Your code is using the ServiceLoader which means each JAR's META-INF directory will be searched for service definitions. The empty JAR file is triggering the error. > java.lang.IllegalStateException: java.util.zip.ZipException: zip file is empty > at > org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:97) > at > org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:260) > at > org.apache.catalina.webresources.StandardRoot.getResourcesInternal(StandardRoot.java:327) > at > org.apache.catalina.webresources.CachedResource.validateResources(CachedResource.java:127) > at org.apache.catalina.webresources.Cache.getResources(Cache.java:147) > at > org.apache.catalina.webresources.StandardRoot.getResources(StandardRoot.java:315) > at > org.apache.catalina.webresources.StandardRoot.getClassLoaderResources(StandardRoot.java:231) > at > org.apache.catalina.loader.WebappClassLoaderBase.findResources(WebappClassLoaderBase.java:939) > at java.lang.ClassLoader.getResources(ClassLoader.java:1142) > at > java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:348) > at > java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393) > at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474) > at javax.xml.parsers.FactoryFinder$1.run(FactoryFinder.java:293) > at java.security.AccessController.doPrivileged(Native Method) > at > javax.xml.parsers.FactoryFinder.findServiceProvider(FactoryFinder.java:289) > at javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:267) > at > javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:120) > at com.MyHelper.createDoc(MyHelper.java:64) > > Can tomcat ignore overridden jar and pull classes from memory only ? No. > Is there some sort of built-in hot deploy I'm not aware of? No. > Or is it related to issue specific for tomcat with empty jar opening No. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
