java.lang.UnsupportedClassVersionError: Unsupported major.minor version 52.0 about java

[taowen]

can you give me the full stacktrace of the error message?

[tokazio]

Trying the code on another platform, it seems to work (asking for decoder).
Can confirm this and give you the full stack next thuesday.

Now i'm getting:
com.jsoniter.spi.JsonException: static gen should provide the decoder we need, but failed to create the decoder at com.jsoniter.Codegen.gen(Codegen.java:80) at com.jsoniter.Codegen.getDecoder(Codegen.java:35) at com.jsoniter.JsonIterator.read(JsonIterator.java:336) at com.jsoniter.JsonIterator.deserialize(JsonIterator.java:373) at net.esyo.utils.JsonUtils.loadFromFile(JsonUtils.java:61) at net.esyo.registry.server.RegistryServer.loadConfig(RegistryServer.java:328) at net.esyo.registry.server.RegistryServer.main(RegistryServer.java:44) Caused by: java.lang.ClassNotFoundException: decoder.net.esyo.registry.server.NetRegistryConfig at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at com.jsoniter.Codegen.gen(Codegen.java:75) ... 6 more

I haven't wrote a decoder but, why is it searching decoder.net.esyo.registry.server.NetRegistryConfig? note the 'decoder' as the base package instead of 'net.esyo'.

[taowen]

static decoder works this way. it will create the the decoder source code in the package "decoder.xxx" prefixing your class name. you do not need to write the decoder, the decoder should be generated by com.jsoniter.StaticCodeGenerator

then in the runtime, it will search for "decoder.xxx". if in static mode, not found such class will be a fatal error, because it expects the class should be generated ahead of time. if in dynamic mode, it will trigger class generation in the runtime (using javaasist).

checkout code https://github.com/json-iterator/java/tree/master/demo
mvn exec:java -Dexec.mainClass=com.jsoniter.demo.Demo

[tokazio]

Multiple java installations misconfiguration.

[tokazio]

Using netbeans with maven.
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_102

Have:
jdk1.7.0_25
jdk1.7.0_79
jdk1.8.0.91
jdk1.8.0_102
jdk-9
Installed in C:\Program Files\Java

Exception in thread "main" java.lang.UnsupportedClassVersionError: net/esyo/utils/JsonUtils : Unsupported major.minor version 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at com.jsoniter.StaticCodeGenerator.main(StaticCodeGenerator.java:17)
Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
	at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
	at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:764)
	at org.codehaus.mojo.exec.ExecMojo.executeCommandLine(ExecMojo.java:711)
	at org.codehaus.mojo.exec.ExecMojo.execute(ExecMojo.java:289)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)

[tokazio]

ok found this: http://stackoverflow.com/questions/4681090/how-do-i-find-where-jdk-is-installed-on-my-windows-machine

Netbeans maven process was using system32/java.exe instead of the JAVA_HOME one...