带有JDK 8的JMonkeyEngine

Question

I want to use lambda expressions, so i need JDK 8. I have set the project to JDK 8, in properties, but editor of the code gives errors when i use lambda. When trying to build it gives error like this: warning: [options] bootstrap class path not set in conjunction with -source 1.7 Test.java:17: error: lambda expressions are not supported in -source 1.7 Runnable r = () -> System.out.println(); (use -source 8 or higher to enable lambda expressions) warning: [options] bootstrap class path not set in conjunction with -source 1.7 Test.java:17: error: lambda expressions are not supported in -source 1.7 Runnable r = () -> System.out.println(); (use -source 8 or higher to enable lambda expressions) So how to set JMonkeyEngine working on JDK 8? Thanks.

Answer 1

I wasn't able to get Java 8 to work within the JMonkey IDE. However I was able to do it the other way round; add JMonkey libraries to Netbeans 8.

• Install Netbeans 8

Then you follow the instructions for adding JMonkey as a library to annother IDE . The instructions are for eclipse (as JMonkey IDE is based on Netbeans it would normally make no sense to do this).

• Download the most recent build of JMonkey
• Unzip and save in your user directory
• Open Netbeans 8

• Either open an existing JMonkey project or Start a new project

• Open the project properties

  

• Select to add JARs

  

• Browse to where you saved the JMonkey build and open the lib folder

  

• Select all the libraries and add them

  

At this point it is now possible to create a JMonkey program using Java 8 code within Netbeans 8. However; the assets folder may still be missing, If you opened an existing project it will likely be there otherwise, again, we follow similar instructions within Setting up JME3 in Eclipse but its arguably easier in netbeans. Its pretty much identical to adding the JARs so I won't include screenshots.

• Open the project properties (again)
• Open the libraries tab
• Click add JAR/Folder
• Browse to assets folder
• Click open

Now you can run your project just as within the JMonkey IDE, using AssetManager to load assets. Of course you won't have all the nice JME specific features of JMonkey IDE.

Note; JMonkey is untested with Java 8 , I got a basic program to run, this does not guarantee success with a more complex program (That said I have now used this technique to move my 500 class game across with zero issues; I love java)