classloader

问题 I'm using Maven for desktop applycation. I read about Maven standart directory layout and I have this project structure for now: App |-- pom.xml `-- src |-- main |-- java | `-- java classes |-- resources | `-- images | `-- app images `--config `--config.xml I want to find a way to load my resources and config files. I read some articles and topics and found this (simplified example from my code): //class for loading config public class Preferences { public Preferences() { InputStream image =

问题 I'm experimenting with using different classloaders to load a particular class, and see if the static variables in that class can have different instances. Basically, I'm trying to write code for what Stephen C has mentioned in this answer. Here are my classes: CustomClassLoader.java class CustomClassLoader extends ClassLoader { public Class loadClass(String classname) throws ClassNotFoundException { return super.loadClass(classname, true); } } Test.java (which contains the driver) class Test

问题 The ProGuard home page lists as a feature: Retargeting and preverifying existing class files for Java 6, to take full advantage of Java 6's faster class loading. What is the difference in Java 6 that this refers to? Is it significant? Does it have impact on slowdowns caused by multithreading through the synchronized aspects of the default classloader? 回答1: As the ProGuard FAQ hints: the Java 6 compiler add preverification information to the class files Looking at the Java Virtual Machine

问题 I am so confused about these two class loaders. When talking about the hierarchy of Java class loaders, usually the bootstrap classloader and ext class loader and the third one (system classloader or app classloader) are mentioned. To be more accurate, I checked the source code of JDK. In class Launcher , there is the code: loader = AppClassLoader.getAppClassLoader(extcl); In class ClassLoader , the method: getSystemClassloader() Also says the system classloader is used to start the

问题 I have read a lot about the Java class loading process lately. Often I came across texts that claimed that it is not possible to add classes to the classpath during runtime and load them without class loader hackery (URLClassLoaders etc.) As far as I know classes are loaded dynamically. That means their bytecode representation is only loaded and transformed to a java.lang.Class object when needed. So shouldn't it be possible to add a JAR or *.class file to the classpath after the JVM started

问题 I have a code that load all classes in folder with same package name ( second ). how can i change it to load all classes in a folder with deference package (not in second ) (and we don't know the package name) int classCounter = 0; File folderAdded = new File("..//940424//second"); File [] classFileAdded = folderAdded.listFiles(); String [] addedClassName = new String [classFileAdded.length]; List<Operations> newOp = new ArrayList<Operations>(); Operations newOpTemp = null; for(int i = 0;

问题 I have a code that load all classes in folder with same package name ( second ). how can i change it to load all classes in a folder with deference package (not in second ) (and we don't know the package name) int classCounter = 0; File folderAdded = new File("..//940424//second"); File [] classFileAdded = folderAdded.listFiles(); String [] addedClassName = new String [classFileAdded.length]; List<Operations> newOp = new ArrayList<Operations>(); Operations newOpTemp = null; for(int i = 0;

问题 I have my application running properly in Jboss. To to write spring webservice client, i have generated classes using wsimport . I have written following in configuration <bean id="messageFactory" class="org.springframework.ws.soap.saaj.SaajSoapMessageFactory"> <property name="messageFactory"> <bean class="com.sun.xml.messaging.saaj.soap.ver1_1.SOAPMessageFactory1_1Impl"/> </property> in jboss?lib i have jboss-jaxws.jar,spring.jar ...Now i copied spring-ws-1.5.0.jar and saaj-impl-1.3.jar but

问题 I have my application running properly in Jboss. To to write spring webservice client, i have generated classes using wsimport . I have written following in configuration <bean id="messageFactory" class="org.springframework.ws.soap.saaj.SaajSoapMessageFactory"> <property name="messageFactory"> <bean class="com.sun.xml.messaging.saaj.soap.ver1_1.SOAPMessageFactory1_1Impl"/> </property> in jboss?lib i have jboss-jaxws.jar,spring.jar ...Now i copied spring-ws-1.5.0.jar and saaj-impl-1.3.jar but

问题 I have some problem with my JSystem/Java/Eclipse enviromment. I get this error and i don't understand what is wrong: java.lang.LinkageError: loader constraint violation: loader (instance of jsystem/runner/loader/ExtendsTestCaseClassLoader) previously initiated loading for a different type with name "org/w3c/dom/Document" I would like know if someone have had a similar issues, I don't think my enviromment is very important for solve it, if I will understand what's happened "undergound" I hope