Hep problems to start with api

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Posts: 1
Joined: Tue Mar 12, 2019 7:00 am

Hep problems to start with api

Post by kullboys » Tue Mar 12, 2019 7:01 am


I usually code in C++ and I need some help to start coding for Bookmap.
I installed Eclipse and copied the jre directory from bookmap into the eclipse directory, hoping it's all I need to create my own jar files but I end up with this error:
java.lang.UnsupportedClassVersionError: velox/api/layer1/layers/tradinghelper/Layer1ApiHelperChaseStrategy has been compiled by a more recent version of the Java Runtime (class file version 54.0), this version of the Java Runtime only recognizes class file versions up to 52.0
Wich JRE is needed?

Posts: 7
Joined: Fri Jul 13, 2018 1:07 pm

Re: Hep problems to start with api

Post by serhii » Wed Mar 13, 2019 12:09 pm

Hi, we use JDK 8 to build our jars.

As I understand you are compiling on JDK 10 (class version 54) and then trying to run on JRE 8 (class version up to 52)

To fix this you need to compile on compliance level 1.8 (JDK 8)
You can specify it in Eclipse settings
try this:
Project menu > Properties > Java Compiler > Compiler compliance level > 1.8

Even better would be to install JDK 8 and set eclipse to use it for compilation.

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