Can run built jar files.

backends.py

@@ -249,10 +249,21 @@ class Backend():
         obj_list = []
         compiler = self.get_compiler_for_source(src_list[0])
         assert(compiler.get_language() == 'java')
+        c = 'c'
+        m = ''
+        e = ''
+        f = 'f'
+        main_class = target.get_main_class()
+        if main_class != '':
+            e = 'e'
         for src in src_list:
             obj_list.append(self.generate_single_java_compile(src, target, compiler, outfile))
         jar_rule = 'java_LINKER'
-        commands = ['cf', self.get_target_filename(target)] + obj_list
+        commands = [c+m+e+f]
+        if e != '':
+            commands.append(main_class)
+        commands.append(self.get_target_filename(target))
+        commands += obj_list
         elem = NinjaBuildElement(outname_rel, jar_rule, [])
         elem.add_dep(obj_list)
         elem.add_item('FLAGS', commands)

build.py

@@ -261,6 +261,10 @@ class BuildTarget():
         if self.custom_install_dir is not None:
             if not isinstance(self.custom_install_dir, str):
                 raise InvalidArguments('Custom_install_dir must be a string')
+        main_class = kwargs.get('main_class', '')
+        if not isinstance(main_class, str):
+            raise InvalidArguments('Main class must be a string')
+        self.main_class = main_class
 
     def get_subdir(self):
         return self.subdir
@@ -526,6 +530,9 @@ class Jar(BuildTarget):
                 raise InvalidArguments('Jar source %s is not a java file.' % s)
         self.filename = self.name + '.jar'
 
+    def get_main_class(self):
+        return self.main_class
+
 class ConfigureFile():
 
     def __init__(self, subdir, sourcename, targetname, configuration_data):

test cases/java/1 basic/meson.build

@@ -1,4 +1,5 @@
 project('simplejava', 'java')
 
-javaprog = jar('myprog', 'com/sourceforge/meson/Simple.java')
+javaprog = jar('myprog', 'com/sourceforge/meson/Simple.java',
+  main_class : 'com.sourceforge.meson.Simple')
 test('mytest', javaprog)