Develop Reference

org.w3c.dom.ElementTraversal Crash When Using Gradle above 4.4

I created a new Android application project on MacOS and I faced this error when I tried to change GradleWrapper in Android Studio.
distributionUrl=https://services.gradle.org/distributions/gradle-4.1-all.zip
to
distributionUrl=https://services.gradle.org/distributions/gradle-4.5-all.zip
(4.4,4.5,4.6) Gradle build will toast this error
Does anybody know how can I fixed this issue?
org.gradle.internal.UncheckedException: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
at org.gradle.internal.UncheckedException.throwAsUncheckedException(UncheckedException.java:63)
at org.gradle.internal.UncheckedException.throwAsUncheckedException(UncheckedException.java:40)
at org.gradle.internal.classloader.ClasspathUtil.getClasspathForClass(ClasspathUtil.java:84)
at org.gradle.internal.classloader.DefaultClassLoaderFactory.createIsolatedClassLoader(DefaultClassLoaderFactory.java:61)
at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:37)
at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.gradle.internal.classloader.ClasspathUtil.getClasspathForClass(ClasspathUtil.java:77)

There's a chance an application has added jar libraries into your Mac's /Library/Java/Extensions directory.
Try removing or moving xercesImpl.jar to a temporary location. This has solved the problem on my Mac.

New AndroidStudio Update gives error and does not Work

I have updated my android studio. After the update it gives me the following message (same occur when the internet is turned off):
Internal Error. Please report to https://code.google.com/p/android/issues
java.lang.ExceptionInInitializerError
at com.intellij.openapi.vfs.LocalFileSystem.getInstance(LocalFileSystem.java:41)
at com.intellij.configurationStore.ApplicationStoreImpl.setPath(ApplicationStoreImpl.kt:50)
at com.intellij.openapi.application.impl.ApplicationImpl$10.run(ApplicationImpl.java:480)
at com.intellij.openapi.components.impl.ComponentManagerImpl.init(ComponentManagerImpl.java:101)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:458)
at com.intellij.openapi.application.impl.ApplicationImpl.load(ApplicationImpl.java:450)
at com.intellij.idea.IdeaApplication.run(IdeaApplication.java:197)
at com.intellij.idea.MainImpl$1$1$1.run(MainImpl.java:52)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: com.intellij.ide.plugins.PluginManager$StartupAbortedException: Fatal error initializing 'com.intellij.openapi.vfs.newvfs.ManagingFS'
at com.intellij.ide.plugins.PluginManager.handleComponentError(PluginManager.java:256)
at com.intellij.openapi.components.impl.PlatformComponentManagerImpl.handleInitComponentError(PlatformComponentManagerImpl.java:43)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:540)
at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:246)
at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:212)
at org.picocontainer.defaults.BasicComponentParameter.resolveInstance(BasicComponentParameter.java:77)
at org.picocontainer.defaults.ComponentParameter.resolveInstance(ComponentParameter.java:114)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getConstructorArguments(ConstructorInjectionComponentAdapter.java:257)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:217)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:53)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:248)
at com.intellij.util.pico.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:59)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:499)
at com.intellij.util.pico.DefaultPicoContainer.getLocalInstance(DefaultPicoContainer.java:246)
at com.intellij.util.pico.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:212)
at org.picocontainer.defaults.CollectionComponentParameter.getArrayInstance(CollectionComponentParameter.java:268)
at org.picocontainer.defaults.CollectionComponentParameter.resolveInstance(CollectionComponentParameter.java:127)
at org.picocontainer.defaults.ComponentParameter.resolveInstance(ComponentParameter.java:116)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getConstructorArguments(ConstructorInjectionComponentAdapter.java:257)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:217)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:53)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:248)
at com.intellij.util.pico.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:59)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:499)
at com.intellij.openapi.components.impl.ComponentManagerImpl.getComponent(ComponentManagerImpl.java:184)
at com.intellij.openapi.vfs.VirtualFileManager.getInstance(VirtualFileManager.java:51)
at com.intellij.openapi.vfs.LocalFileSystem$LocalFileSystemHolder.<clinit>(LocalFileSystem.java:37)
... 23 more
Caused by: java.lang.NoClassDefFoundError: jsr166e/extra/SequenceLock
at com.intellij.util.io.PagedFileStorage$StorageLock.<init>(PagedFileStorage.java:489)
at com.intellij.util.io.PagedFileStorage$StorageLock.<init>(PagedFileStorage.java:499)
at com.intellij.util.io.PagedFileStorage.<clinit>(PagedFileStorage.java:89)
at com.intellij.util.io.PagedFileStorage$StorageLockContext.<init>(PagedFileStorage.java:798)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecords$DbConnection.init(FSRecords.java:286)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecords$DbConnection.connect(FSRecords.java:187)
at com.intellij.openapi.vfs.newvfs.persistent.FSRecords.connect(FSRecords.java:576)
at com.intellij.openapi.vfs.newvfs.persistent.PersistentFSImpl.initComponent(PersistentFSImpl.java:87)
at com.intellij.openapi.components.impl.ComponentManagerImpl$ComponentConfigComponentAdapter.getComponentInstance(ComponentManagerImpl.java:522)
... 47 more
Caused by: java.lang.ClassNotFoundException: jsr166e.extra.SequenceLock
at com.intellij.util.lang.UrlClassLoader.findClass(UrlClassLoader.java:207)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 56 more
Do you know how to fix it? I did update Java and restart the computer many times.
Cheers for your help!

Plugins may make some issues after updating Android Studio to 2.3.
Just try to disable the plugins that reports any error when you are opening the Studio. Then restart the Android studio.
This worked for me. I had similar issue and I checked stack traces of studio and found that the issue was due to some error in Firebase plugin after Android Studio update. I'm not even using firebase in current project so I don't know how that makes a problem. I just disable firebase plugin and then now my device is showing in the Select Deployment Target window.

xamarin Android App Error

I am starting with Xamarin with Visual Studio and created my simple first blank project but getting below error when adding an Android Layout
java.lang.UnsupportedClassVersionError: mono/android/AndroidDesignerHost : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: mono.android.AndroidDesignerHost. Program will exit.
Exception in thread "main"

AndroiStudio test fails with Class Not Found Exception

When I try to run my test it gives me this error
Exception in thread "main" java.lang.NoClassDefFoundError: junit/textui/ResultPrinter
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:116)
Caused by: java.lang.ClassNotFoundException: junit.textui.ResultPrinter
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Process finished with exit code 1
I tried most of solution that I could find online but nothing helped to fix and it gets really annoying. Any tips to fix that ?

Gradle Error and java.lang.ClassNotFoundException

The first error I had was this:
Android Studio error installing Gradle
And when i fixed that i had a new error:
Internal error: (java.lang.ClassNotFoundException) org.slf4j.LoggerFactory
java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at org.gradle.tooling.internal.consumer.loader.DefaultToolingImplementationLoader.<clinit>(DefaultToolingImplementationLoader.java:45)
at org.gradle.tooling.internal.consumer.ConnectorServices$ConnectorServiceRegistry.createToolingImplementationLoader(ConnectorServices.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.gradle.internal.service.DefaultServiceRegistry.invoke(DefaultServiceRegistry.java:175)
at org.gradle.internal.service.DefaultServiceRegistry.access$300(DefaultServiceRegistry.java:47)
at org.gradle.internal.service.DefaultServiceRegistry$FactoryMethodService.create(DefaultServiceRegistry.java:336)
at org.gradle.internal.service.DefaultServiceRegistry$ManagedObjectProvider.getInstance(DefaultServiceRegistry.java:240)
at org.gradle.internal.service.DefaultServiceRegistry$SingletonService.getService(DefaultServiceRegistry.java:275)
at org.gradle.internal.service.DefaultServiceRegistry$OwnServices.getService(DefaultServiceRegistry.java:215)
at org.gradle.internal.service.DefaultServiceRegistry.doGet(DefaultServiceRegistry.java:145)
at org.gradle.internal.service.AbstractServiceRegistry.get(AbstractServiceRegistry.java:65)
at org.gradle.internal.service.SynchronizedServiceRegistry$1.create(SynchronizedServiceRegistry.java:38)
at org.gradle.internal.concurrent.Synchronizer.synchronize(Synchronizer.java:31)
at org.gradle.internal.service.SynchronizedServiceRegistry.get(SynchronizedServiceRegistry.java:36)
at org.gradle.tooling.internal.consumer.ConnectorServices.createConnector(ConnectorServices.java:36)
at org.gradle.tooling.GradleConnector.newConnector(GradleConnector.java:64)
at com.android.tools.idea.jps.builder.AndroidGradleBuilder.doBuild(AndroidGradleBuilder.java:266)
at com.android.tools.idea.jps.builder.AndroidGradleBuilder.build(AndroidGradleBuilder.java:136)
at org.jetbrains.jps.incremental.IncProjectBuilder.runModuleLevelBuilders(IncProjectBuilder.java:1051)
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:792)
at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:823)
at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:755)
at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:576)
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:339)
at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:180)
at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:129)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:220)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:112)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler$1.run(BuildMain.java:132)
at org.jetbrains.jps.service.impl.SharedThreadPoolImpl$1.run(SharedThreadPoolImpl.java:41)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
PD: Sorryfor my bad english and the format of the question this is my first question.

I had the same java.lang.ClassNotFoundException exception, trying to include jsoup.
What helped me was opening the terminal, going to the root of the project and executing
gradle clean
gradle assemble