Develop Reference

I have an error when im trying to compile an apk

I've been trying to make an apk and got the following error:
Error:Internal error: (java.lang.UnsupportedClassVersionError) org/jetbrains/jps/android/model/impl/JpsAndroidModelSerializerExtension : Unsupported major.minor version 52.0
java.lang.UnsupportedClassVersionError: org/jetbrains/jps/android/model/impl/JpsAndroidModelSerializerExtension : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:363)
at java.util.ServiceLoader$1.next(ServiceLoader.java:445)
at com.intellij.util.containers.ContainerUtilRt.copy(ContainerUtilRt.java:179)
at com.intellij.util.containers.ContainerUtilRt.newArrayList(ContainerUtilRt.java:168)
at org.jetbrains.jps.plugin.impl.JpsPluginManagerImpl.loadExtensions(JpsPluginManagerImpl.java:18)
at org.jetbrains.jps.service.impl.JpsServiceManagerImpl.getExtensions(JpsServiceManagerImpl.java:59)
at org.jetbrains.jps.model.serialization.JpsModelSerializerExtension.getExtensions(JpsModelSerializerExtension.java:46)
at org.jetbrains.jps.model.serialization.library.JpsLibraryTableSerializer.getRootType(JpsLibraryTableSerializer.java:185)
at org.jetbrains.jps.model.serialization.library.JpsLibraryTableSerializer.loadLibrary(JpsLibraryTableSerializer.java:115)
at org.jetbrains.jps.model.serialization.library.JpsLibraryTableSerializer.loadLibrary(JpsLibraryTableSerializer.java:92)
at org.jetbrains.jps.model.serialization.library.JpsLibraryTableSerializer.loadLibraries(JpsLibraryTableSerializer.java:65)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader$GlobalLibrariesSerializer.loadExtension(JpsGlobalLoader.java:128)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader$GlobalLibrariesSerializer.loadExtension(JpsGlobalLoader.java:121)
at org.jetbrains.jps.model.serialization.JpsLoaderBase.loadComponents(JpsLoaderBase.java:61)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.loadGlobalComponents(JpsGlobalLoader.java:83)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.load(JpsGlobalLoader.java:73)
at org.jetbrains.jps.model.serialization.JpsGlobalLoader.loadGlobalSettings(JpsGlobalLoader.java:59)
at org.jetbrains.jps.model.serialization.impl.JpsSerializationManagerImpl.loadModel(JpsSerializationManagerImpl.java:38)
at org.jetbrains.jps.cmdline.JpsModelLoaderImpl.loadModel(JpsModelLoaderImpl.java:45)
at org.jetbrains.jps.cmdline.BuildRunner.load(BuildRunner.java:78)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:266)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:125)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler$1.run(BuildMain.java:232)
at org.jetbrains.jps.service.impl.SharedThreadPoolImpl$1.run(SharedThreadPoolImpl.java:44)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
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:745)
Please help me to solve this issue.

This issue you might got due to following reasons:
You might using some library in your projects which are either compiled using newer java version or older java version which is not supported by your machines jvm.
It might be possible that your Android Studio is corrupted so reinstalled it.
If you are trying to read the serialize object, which is serialized using old java version of new java version, and not supported by the jvm.
Hopefully this will help you.
Cheers

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 ?

Can't open ddms

I am using ubuntu 14.04 LTS to build android using command line. However after I open emulator, trying to open ddms. I got the following error message
09:36:10 E/ddms: shutting down due to uncaught exception 09:36:10
E/ddms: org/eclipse/jface/util/IPropertyChangeListener
java.lang.NoClassDefFoundError:
org/eclipse/jface/util/IPropertyChangeListener at
com.android.ddms.Main.main(Main.java:74) Caused by:
java.lang.ClassNotFoundException:
org.eclipse.jface.util.IPropertyChangeListener at
java.net.URLClassLoader$1.run(URLClassLoader.java:366) at
java.net.URLClassLoader$1.run(URLClassLoader.java:355) at
java.security.AccessController.doPrivileged(Native Method) at
java.net.URLClassLoader.findClass(URLClassLoader.java:354) at
java.lang.ClassLoader.loadClass(ClassLoader.java:425) at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at
java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 1 more
It seems that there is a class not being found. But I am not sure what exactly it means.
After searching, I found it may be wrong ANDROID_SWT. However after I check, there still exist the same problem.
Any idea can help! Thx!

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