classloader

问题 static boolean isClassLoaded(String fullname) { try { Class.forName(fullname, false, Loader.instance().getModClassLoader()); return true; } catch (Exception e) { return false; } } does this method has potential to trigger fullname's static initializer ? i have problem with static initializer called twice. when i try to check if class loaded using isClassLoaded and try to use that class, i get error because of constructor called twice. anyone know what is problem with Class.forName(fullname,

问题 java.lang.NoSuchMethodError: org/apache/http/conn/scheme/Scheme.(Ljava/lang/String;ILorg/apache/http/conn/scheme/SchemeSocketFactory;)V I'm getting this error running WAS 8.5. My web app depends on http client 4.1.1 but it seems i'm getting a different class loaded on WAS. How can I exclude the http client library from my apps class path on was 8.5? 回答1: Try using "parent last" classloading so that you use your own classes instead of the ones from WAS. Change it for the application and

问题 It is said that class loader of java adds security to JRE , if its function is to load all of the classes how can it provide security to java,can you shed some light on this topic,any help is appreciated. I am talking about security from network sources,security from those classes imported from network. 回答1: This link might help. Java can provide a "sandbox" environment which can be customized. It restricts class from accessing resources outside the sandbox. 来源： https://stackoverflow.com

问题 I'm trying to make a simple application that loads and runs some classes during runtime. For example, let's say I have this config: module1.classpath=module1.jar,somelibs1.jar module1.class=com.blabla.Module1 module2.classpath=module2.jar,somelibs2.jar module2.class=com.blabla.Module2 Then I need to load libraries specified in module1.classpath and run the module1.class with that libraries loaded. Afterwards I need to load module2.classpath and run module2.clas s with those libraries. How do

问题 Could anybody please explain how the Core Classloader loads resources when, for instance, surefire test plugin is used? What I'd especially need to know is the order in which project sources and resources from target/classes + target/test-classes AND project dependencies are loaded. For instance, if I have a resource which exists both in a project and in a dependency. Which one is loaded first? Thank you 回答1: It turned out the answer was really simple. First off, one can see the plugin

问题 I've built by Maven a war file that uses other war overlays as dependencies... The built was successful. But while deploying to Jboss I get the following error: 11:27:49,054 ERROR [org.springframework.web.context.ContextLoader] (MSC service thread 1-1) .... nested exception is java.lang.NoClassDefFoundError: org/springframework/core/type/classreading/AnnotationMetadataReadingVisitor at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents

问题 I have a board with cards in which I have to find matches. I have two variables buttonA and buttonB to keep track of the squares clicked. When they are equal I can remove them from the board by simply adding this code: cards[buttonA].setVisible(false); cards[buttonB].setVisible(false); How can I place the same image on all the buttons after finding matches? I tried the following but it instead of changing the image simply leaves the same image on the buttons cards[buttonA].setIcon(new

问题 I have a project using the standard Maven web app layout, deployed within Tomcat 8.5 in Eclipse Photon (with latest updates). Inside of src\main\webapp\WEB-INF\applicationContext.xml , there is an <import resource="classpath:/other-spring-stuff.xml" /> I verified the other-spring-stuff.xml which is normally sitting in src/main/resources , appears in the root of the WAR generated by mvn install . But when trying to run the app in Tomcat within Eclipse, I get: 20:37:17 SEVERE: Servlet

问题 In attempting to load an AOT-compiled class from a non-default classpath, I receive the following exception: Traceback (innermost last): File "test.jy", line 10, in ? at clojure.lang.Namespace.<init>(Namespace.java:34) at clojure.lang.Namespace.findOrCreate(Namespace.java:176) at clojure.lang.Var.internPrivate(Var.java:149) at aot_demo.JavaClass.<clinit>(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at sun.reflect

问题 How to resolve 1 particular flavor of 'java result 1' in the context of using JVMTI agents? 回答1: Here's how I resolved an issue in my context: The server is run through an ANT script with jvm configured with an agent (the property name 'agentfile' below is associated with a value pointing to the agent library) Now, I would get the error 'java result 1' whenever the server was run, without any indication of the actual error. Here's how this issue was debugged. 1) The agent was turned off (i.e.