在运行时编译Java文件可在Eclipse上运行，但不能从导出的可运行jar文件中运行

Question

I've tried to compile, at runtime, a .java file from code and everything works fine on eclipse. But when I've tried to export the project, making a runnable jar file and then execute the jar... well, nothing happens. Why it doesn't work from the runnable jar file?

Here's what I see on the java console after the execution of the jar:

30/10/15 13:47:19,597 iconservicesagent[265]: 
Failed to get the real path for: /var/folders/xd/jg7p911x3bd76jyy071hl6lw0000gn/
C/com.apple.iconservices

And here the java code that I use to compile a source file:

try {
         JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
         DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
         StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);
         Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjectsFromStrings(Arrays.asList("generated/Crilin.java"));
         JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, diagnostics, null,
                 null, compilationUnits);
        task.call();

            fileManager.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

Answer 1

Great question, I will give the step by step instructions:

1.) In Eclipse have your desired program highlighted, then click Run

2.) Go down the list to Run Configuration and click that

3.) Make sure you select the right class as your main if there are multiple classes!

4.) Name the program and then apply changes

5.) Then right click on the project name and click Export

6.) Under the Java Section click Runnable JAR File

7.) Then go through the drop down box till you find your program

8.) Then export it to wherever you want it saved

After you do all this the program should run from outside of Eclipse!