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java Programming Glossary: classloaderHow to really read text file from classpath in Java http://stackoverflow.com/questions/1464291/how-to-really-read-text-file-from-classpath-in-java directory on the classpath from a class loaded by the same classloader you should be able to use either of From ClassLoader all paths..
http://stackoverflow.com/questions/148681/unloading-classes-in-java actually killing the JVM Hope this makes sense java classloader share improve this question The only way that a Class can.. This means references to every single class and to the classloader itself need to go the way of the dodo. One possible solution.. delegates the actual loading of classes to specific Jar classloaders. That way you can point to different versions of the jar file..
How can I enumerate all classes in a package and add them to a List? http://stackoverflow.com/questions/176527/how-can-i-enumerate-all-classes-in-a-package-and-add-them-to-a-list potentially add classes into a package. Even worse the classloader will load classes on demand and part of the classpath might..
Classpath including JAR within a JAR http://stackoverflow.com/questions/183292/classpath-including-jar-within-a-jar of to do that. The first is One Jar which uses a special classloader to allow the nesting of jars. The second is UberJar or Shade..
How to load a jar file at runtime http://stackoverflow.com/questions/194698/how-to-load-a-jar-file-at-runtime adding new classes . java jar runtime class loading classloader share improve this question Reloading existing classes with..
Find where java class is loaded from http://stackoverflow.com/questions/227486/find-where-java-class-is-loaded-from anyone know how to programmaticly find out where the java classloader actually loads the class from I often work on large projects.. not really an option. I recently had a problem where the classloader was loading an incorrect version of a class because it was on.. classpath in two different places. So how can I get the classloader to tell me where on disk the actual class file is coming from..
How do you change the CLASSPATH within Java? http://stackoverflow.com/questions/252893/how-do-you-change-the-classpath-within-java a URLClassLoader with a url that are not in the parent classloaders url's. URL url new URL file foo URLClassLoader loader new URLClassLoader.. Add the conf dir to the classpath Chain the current thread classloader URLClassLoader urlClassLoader new URLClassLoader new URL new.. mtFile .toURL currentThreadClassLoader Replace the thread classloader assumes you have permissions to do so Thread.currentThread .setContextClassLoader..
Scanning Java annotations at runtime http://stackoverflow.com/questions/259140/scanning-java-annotations-at-runtime loading so they are accessible remotely. java annotations classloader share improve this question Use org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider..
How to lock compiled Java classes to prevent decompilation? http://stackoverflow.com/questions/49379/how-to-lock-compiled-java-classes-to-prevent-decompilation the obfuscation is to use encrypted JAR files and a custom classloader that does the decryption preferably using native runtime library..
How should I load Jars dynamically at runtime? http://stackoverflow.com/questions/60764/how-should-i-load-jars-dynamically-at-runtime so that a better one could bubble up past it. java jar classloader share improve this question The reason it's hard is security... I'm actually very surprised that works with the system classloader. Here's how you do it making your own child classloader URLClassLoader.. classloader. Here's how you do it making your own child classloader URLClassLoader child new URLClassLoader myJar.toURL this.getClass..
URL to load resources from the classpath in Java http://stackoverflow.com/questions/861500/url-to-load-resources-from-the-classpath-in-java Is there a protocol to load resources using the current classloader This is similar to the Jar protocol except that I do not need.. public class Handler extends URLStreamHandler The classloader to find resources from. private final ClassLoader classLoader..
How to really read text file from classpath in Java http://stackoverflow.com/questions/1464291/how-to-really-read-text-file-from-classpath-in-java CLASSPATH and try below InputStream in this.getClass .getClassLoader .getResourceAsStream SomeTextFile.txt InputStream in this.getClass.. SomeTextFile.txt InputStream in this.getClass .getClassLoader .getResourceAsStream SomeTextFile.txt InputStream in this.getClass.. SomeTextFile.txt InputStream in this.getClass .getClassLoader .getResourceAsStream SomeTextFile.txt Place full path of file..
How can I enumerate all classes in a package and add them to a List? http://stackoverflow.com/questions/176527/how-can-i-enumerate-all-classes-in-a-package-and-add-them-to-a-list have to scan the filesystem in a manner similar to how the ClassLoader would look for class definitions. There are a lot of samples.. Package pkgname becomes Path relPath URL resource ClassLoader.getSystemClassLoader .getResource relPath System.out.println.. becomes Path relPath URL resource ClassLoader.getSystemClassLoader .getResource relPath System.out.println ClassDiscovery Resource..
How to load a jar file at runtime http://stackoverflow.com/questions/194698/how-to-load-a-jar-file-at-runtime can load new code into new class loaders relatively easily ClassLoader loader URLClassLoader.newInstance new URL yourURL getClass .getClassLoader.. new class loaders relatively easily ClassLoader loader URLClassLoader.newInstance new URL yourURL getClass .getClassLoader Class clazz.. URLClassLoader.newInstance new URL yourURL getClass .getClassLoader Class clazz Class.forName mypackage.MyClass true loader Class..
getResourceAsStream() vs FileInputStream http://stackoverflow.com/questions/2308188/getresourceasstream-vs-fileinputstream respectively . This way you can grab them with help of the ClassLoader by ClassLoader#getResource or ClassLoader#getResourceAsStream.. This way you can grab them with help of the ClassLoader by ClassLoader#getResource or ClassLoader#getResourceAsStream . It is able.. with help of the ClassLoader by ClassLoader#getResource or ClassLoader#getResourceAsStream . It is able to locate files relative to..
How do you change the CLASSPATH within Java? http://stackoverflow.com/questions/252893/how-do-you-change-the-classpath-within-java the system classpath. Instead you need to define a new ClassLoader. ClassLoaders work in a hierarchical manner... so any class.. classpath. Instead you need to define a new ClassLoader. ClassLoaders work in a hierarchical manner... so any class that makes a.. static reference to class X needs to be loaded in the same ClassLoader as X or in a child ClassLoader. You can NOT use any custom ClassLoader..
How should I load Jars dynamically at runtime? http://stackoverflow.com/questions/60764/how-should-i-load-jars-dynamically-at-runtime I'm told there's a way of doing it by writing your own ClassLoader but that's a lot of work for something that should in my mind.. Here's how you do it making your own child classloader URLClassLoader child new URLClassLoader myJar.toURL this.getClass .getClassLoader.. your own child classloader URLClassLoader child new URLClassLoader myJar.toURL this.getClass .getClassLoader Class classToLoad..
Creating a memory leak with Java http://stackoverflow.com/questions/6470651/creating-a-memory-leak-with-java faster . The thread loads a class via an optionally custom ClassLoader. The class allocates a large chunk of memory e.g. new byte 1000000.. thread clears all references to the custom class or the ClassLoader it was loaded from. Repeat. This works because the ThreadLocal.. to its Class which in turn keeps a reference to its ClassLoader. The ClassLoader in turn keeps a reference to all the Classes..
Different ways of loading a file as an InputStream http://stackoverflow.com/questions/676250/different-ways-of-loading-a-file-as-an-inputstream the difference between InputStream is this.getClass .getClassLoader .getResourceAsStream fileName and InputStream is Thread.currentThread.. and InputStream is Thread.currentThread .getContextClassLoader .getResourceAsStream fileName and InputStream is this.getClass.. is interpreted. Basically you have 2 different methods ClassLoader.getResourceAsStream and Class.getResourceAsStream . These two..
URL to load resources from the classpath in Java http://stackoverflow.com/questions/861500/url-to-load-resources-from-the-classpath-in-java The classloader to find resources from. private final ClassLoader classLoader public Handler this.classLoader getClass .getClassLoader.. classLoader public Handler this.classLoader getClass .getClassLoader public Handler ClassLoader classLoader this.classLoader classLoader.. this.classLoader getClass .getClassLoader public Handler ClassLoader classLoader this.classLoader classLoader @Override protected..
How do you change the CLASSPATH within Java? http://stackoverflow.com/questions/252893/how-do-you-change-the-classpath-within-java public void addURL URL url throws Exception URLClassLoader classLoader URLClassLoader ClassLoader.getSystemClassLoader Class clazz.. Class URL.class method.setAccessible true method.invoke classLoader new Object url addURL new File conf .toURL This should work..
How to use a JDBC driver from an arbitrary location http://stackoverflow.com/questions/288828/how-to-use-a-jdbc-driver-from-an-arbitrary-location load the driver using this code for example URLClassLoader classLoader new URLClassLoader new URL jar URL this.getClass .getClassLoader.. driver Driver Class.forName jdbc driver class name true classLoader .newInstance But then the driver manager still won't pick it.. whatever classloader you want. For example URLClassLoader classLoader new URLClassLoader new URL path to my jdbc driver jar this.getClass..
How do I programmatically compile and instantiate a Java class? http://stackoverflow.com/questions/2946338/how-do-i-programmatically-compile-and-instantiate-a-java-class Load and instantiate compiled class. URLClassLoader classLoader URLClassLoader.newInstance new URL root.toURI .toURL Class cls.. root.toURI .toURL Class cls Class.forName test.Test true classLoader Should print hello . Object instance cls.newInstance Should..
How to load a Java class dynamically on android/dalvik? http://stackoverflow.com/questions/3022454/how-to-load-a-java-class-dynamically-on-android-dalvik do this String jarFile path to jarfile.jar DexClassLoader classLoader new DexClassLoader jarFile tmp null getClass .getClassLoader.. jarFile tmp null getClass .getClassLoader Class myClass classLoader.loadClass MyClass For this to work the jar file should contain..
How do I get my current working directory in Java? http://stackoverflow.com/questions/3153337/how-do-i-get-my-current-working-directory-in-java Why is public static String getCleanPath ClassLoader classLoader ExcelFile.class.getClassLoader File classpathRoot new File classLoader.getResource.. ExcelFile.class.getClassLoader File classpathRoot new File classLoader.getResource .getPath return classpathRoot.getPath Better than.. use ClassLoader#getResource File classpathRoot new File classLoader.getResource .getPath File csvFiles classpathRoot.listFiles new..
How to read properties file in web application? http://stackoverflow.com/questions/3160691/how-to-read-properties-file-in-web-application as returned by Thread#getContextClassLoader . ClassLoader classLoader Thread.currentThread .getContextClassLoader This returns the.. So you need to load the properties files relative to that. classLoader.getResourceAsStream auth.properties If you opt for using the..
http://stackoverflow.com/questions/3291637/alternatives-to-java-lang-reflect-proxy-for-creating-proxies-of-abstract-classes do the following Dog dog SomeOtherProxy.newProxyInstance classLoader Dog.class h dog.fetch Will be handled by the invocation handler..
Java static class initialization http://stackoverflow.com/questions/3499214/java-static-class-initialization hasn't already initialized by using Class.forName fqn true classLoader or the short form Class.forName fqn share improve this answer..
How to load resource from jar file packaged in a war file? http://stackoverflow.com/questions/4585553/how-to-load-resource-from-jar-file-packaged-in-a-war-file context classloader instead of servletcontext. ClassLoader classLoader Thread.currentThread .getContextClassLoader InputStream input.. .getContextClassLoader InputStream input classLoader.getResourceAsStream test.properties ... The WEB INF folder convention.. be part of the classpath use META INF instead. ClassLoader classLoader Thread.currentThread .getContextClassLoader InputStream input..
Android ClassNotFoundException http://stackoverflow.com/questions/4880489/android-classnotfoundexception . This can then apparently cause problems with the classLoader. If this was happening on a users phone i cant see why i cannot..
URL to load resources from the classpath in Java http://stackoverflow.com/questions/861500/url-to-load-resources-from-the-classpath-in-java to find resources from. private final ClassLoader classLoader public Handler this.classLoader getClass .getClassLoader public.. private final ClassLoader classLoader public Handler this.classLoader getClass .getClassLoader public Handler ClassLoader classLoader.. getClass .getClassLoader public Handler ClassLoader classLoader this.classLoader classLoader @Override protected URLConnection..
How to find annotated methods in a given package? http://stackoverflow.com/questions/862106/how-to-find-annotated-methods-in-a-given-package throws ClassNotFoundException IOException ClassLoader classLoader Thread.currentThread .getContextClassLoader String path packageName.replace.. path packageName.replace '.' ' ' Enumeration URL resources classLoader.getResources path List File dirs new ArrayList File while resources.hasMoreElements..
How to get a path to a resource in a Java JAR file http://stackoverflow.com/questions/941754/how-to-get-a-path-to-a-resource-in-a-java-jar-file get a path to a file only the file contents ClassLoader classLoader getClass .getClassLoader PrintInputStream classLoader.getResourceAsStream.. classLoader getClass .getClassLoader PrintInputStream classLoader.getResourceAsStream config netclient.p If I do this ClassLoader.. config netclient.p If I do this ClassLoader classLoader getClass .getClassLoader File file new File classLoader.getResource..
Dealing with “Xerces hell” in Java/Maven? http://stackoverflow.com/questions/11677572/dealing-with-xerces-hell-in-java-maven and both jars will be included as resolved dependencies Classloader Hell As mentioned above the JRE ships with Xerces in the JAXP..
http://stackoverflow.com/questions/148681/unloading-classes-in-java The only way that a Class can be unloaded is if the Classloader used is garbage collected. This means references to every single.. dodo. One possible solution to your problem is to have a Classloader for every jar file and a Classloader for each of the AppServers.. problem is to have a Classloader for every jar file and a Classloader for each of the AppServers that delegates the actual loading..
Bamboo Ant Task fails when running junit task http://stackoverflow.com/questions/16481801/bamboo-ant-task-fails-when-running-junit-task System's classloader rather than being handled by the Ant Classloader the system Classloader has no knoweldge of JUnit since JUnit.. than being handled by the Ant Classloader the system Classloader has no knoweldge of JUnit since JUnit isn't on the core Ant.. already been loaded to have reached this point the Ant Classloader can see the JUnit jars loaded by Ivy but the Split Classloader..
http://stackoverflow.com/questions/2424604/what-is-a-java-classloader read a wiki article. Someone asked me to be more precise. Classloader loads classes. Ok. So if I include jar files and import a classloader..
Java Dynamically Loading a class http://stackoverflow.com/questions/3580752/java-dynamically-loading-a-class so here's a rewritten version that also caches the Classloader and the addUrl method import java.lang.reflect.Method import..
CMSPermGenSweepingEnabled vs CMSClassUnloadingEnabled http://stackoverflow.com/questions/3717937/cmspermgensweepingenabled-vs-cmsclassunloadingenabled that the root cause of perm gen issues is still usually Classloader leaks this is more about the message that the JVM produces if..
Java, Classpath, Classloading => Multiple Versions of the same jar/project http://stackoverflow.com/questions/6105124/java-classpath-classloading-multiple-versions-of-the-same-jar-project to seperate them somehow Most likely not How does the Classloader handle this in case a Class is the same in all three jars. Which.. in all three jars. Which one is loaded and why Does the Classloader only pickup exactly one jar or does it mix classes arbitrarily.. so that the are seen as one unit package by the Classloader or somehow linked java jar classpath classloader share improve..
how to make maven use test resources http://stackoverflow.com/questions/6267312/how-to-make-maven-use-test-resources test resources rather than the main resources EDIT I use Classloader to find my resources. Classloader can find resources from my.. resources EDIT I use Classloader to find my resources. Classloader can find resources from my src test resources directory but..
What makes hot deployment a “hard problem”? http://stackoverflow.com/questions/660437/what-makes-hot-deployment-a-hard-problem have nice diagrams to illustrate part of the problem . Classloader leaks the dreaded java.lang.OutOfMemoryError PermGen space exception..
What is the difference between Class.getResource() and ClassLoader.getResource()? http://stackoverflow.com/questions/6608795/what-is-the-difference-between-class-getresource-and-classloader-getresource an absolute resource name by using a leading slash. Classloader resource paths are always deemed to be absolute. So there are..
Are Java static initializers thread safe? http://stackoverflow.com/questions/878577/are-java-static-initializers-thread-safe this code block will be called Im guessing its when the Classloader first loads it. I realize I could synchronize on the class in..
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