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(7.52s) Convert byte code - optimized dex. Error java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.
link: You are correct. See https://www.b4x./?query=major.minor+version+52.0
link: Have you updated your java SDK? It now needs version 8 if not mistaken

Okey i solved it, my enviroment variable was pointed to JRE 1.7.XXXX, changed to JRE 1.8.XXXX and worked like a charm. Unsupported major.minor version 52.0 <--- this has nothing to do with the Java JDK version, it is a kind of error code. silly me...
link: When I run the source code from post 1 I get the following error in the IDE log: java.lang.ExceptionInInitializerError Caused by: java.lang.RuntimeE
link: Program started. App identifier: b4j.example.main Success: true StdOut: StdErr: java.lang.UnsupportedClassVersionError: : Unsupported major.minor ve

getting error java.lang.UnsupportedClassVersionError: : Unsupported major.minor version 52.0
link: Hi, I get this in Logs at first run both Demo and Template: java.lang.UnsupportedClassVersionError: : Unsupported major.minor version 52.0 Any idea
link: Hi Alwaysbusy This looks amazing. I tried to run it in b4j and I get the following error. I previously upgraded java to version 8 update 66 I get it
link: I've been thinking... (yeah, I think too much) After seeing all the changes for the upcomming version, I wonder if its not time for a major version up

When try to run or debug the Push Server, output this error: java.lang.UnsupportedClassVersionError: $Customizer : Unsupported major.minor version 52.0 I´m using B4J v4.20 and the PushServer I got today in the first post thanks
link: All fine here: - B4J v4.20 - OKHTTP v1.01 - Jserver v2.51 - java jdk1.8.0_45 Maybe a Java JDK related error : see http://stackoverflow.-to-jetty-9-3

The jRDC2 server was compiled with Java 1.8 (major.minor version 52.0), but your installed version is 1.7. You need 1.8 (or higher) to run your jRDC2 version.
link: my jar file on linux server give me version error. here are logs : $ java -jar result.jar Exception in thread "main" java.lang.UnsupportedClassVersio

(1.52s) Convert byte code - optimized dex. Error java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoad

Annamobbene: https://www.b4x.com/android/forum/threads/b4a-7-00-major-minor-version-52-0.81129/

https://www.b4x./?query=Unsupported+major.minor+version+52.0
link: (1.38s) Convirtiendo byte code a dex optimizado. Error java.lang.UnsupportedClassVersionError: com/android/dx/command/Main : Unsupported major.mino

Then it seems you need to use a newer version of Java 8 Check the results here https://www.b4x./?query=Unsupported+major.minor+version+52.0
link: After fixing that there was no change in the B4A sdk manager output so I ran the sdkmanager.bat from the command line again and I get the following er

https://www.b4x./?query=+Unsupported+major.minor+version+52.0
link: The error is happening on everything I try to compile even things that were ok a couple of days ago and havent been changed... (I am using B4A 7.80)

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