Java unsupported major minor version 52.0 [duplicate]

Question

I can not launch my java application as a web applet in HTML (I am using HTML 4.01, I know it doesn't work in html5). The error message it returns is:

java : Unsupported major.minor version 52.0

I have tried downgrading my java JRE/JDK/SDK but I still get the same error message. The current version of java I am now using is 1.8.0_05.

Bouffant

Look at the loooooong list of related questions on the right. – Milli

that is the 51.0 version, and I have tried the solutions – Bouffant

You must compile for an old version of the JRE, the one you run in your browser. This is done by using the target parameter. See docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/… – Vertievertiginous

I will take a look at that now – Bouffant

I cant seem to -target the JRE like you said it seems to want the sdk – Bouffant

You current version is almost certainly not 1.8.0_05. Try javatester.org/version.html – Cradling

when I type in java -version into cmd thats what it comes out with – Bouffant

Maybe it is a duplicate, but searching for the 52.0 message error take me here. – Kingsly

Simply set your environment variable Java home to the new version of java.. that solves the probelm – Leastwise

Consider accepting the top answer. Even though this is a dup you can check it off if it was helpful. – Winterize

Answer 1

Your code was compiled with Java Version 1.8 while it is being executed with Java Version 1.7 or below.

In your case it seems that two different Java installations are used, the newer to compile and the older to execute your code.

Try recompiling your code with Java 1.7 or upgrade your Java Plugin.

Surfacetosurface

I have done all of that and now the error is "java.lang.reflect.InvocationTargetException" – Bouffant

I had this problem when using the Stanford Parser jars. Thanks @Leonard – Printing

Linux/Mac check echo $JAVA_HOME if it's not pointing to Java 7 folder – Druggist

For Windows use this echo %JAVA_HOME% to check for Java_Home path. – Mattson

Answer 2

You have to compile with Java 1.7. But if you have *.jsp files, you should also completely remove Java 1.8 from the system. If you use Mac, here is how you can do it.

Wildawildcat

Answer 3

I noticed that in netbeans Apache configuration in the servers tab. you can state the platform for your web application. I changed to 1.8 and it worked fine. (I am targeting java 8 platform in my application). Hope that might t help.

Feather

Answer 4

I assumed openjdk8 would work with tomcat8 but I had to remove it and keep openjdk7 only, this fixed the issue in my case. I really don't know why or if there is something else I could have done.

Henleigh