import uk.ac.man.xman.dsl.ConditionDSLStandaloneSetup

@RunWith(XtextRunner)

class ParsingText {

       @Test
       def void parseSampleText () {
               new StandaloneSetup().setPlatformUri("../");
                val injector = new ConditionDSLStandaloneSetup().createInjectorAndDoEMFRegistration();
                val resourceSet = injector.getInstance(typeof(XtextResourceSet));
                resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);
                val uri  = URI.createURI("dummy:/example.cdsl")
                val resource = resourceSet.createResource(uri); //ERROR happened here
                val in = new ByteArrayInputStream("((id1 == 1) && (id2 == 2))".getBytes());
                resource.load(in, resourceSet.getLoadOptions());
       }
}

grammar uk.ac.man.xman.dsl.ConditionDSL with org.eclipse.xtext.common.Terminals

generate conditionDSL "www.ac.uk/xman/dsl/ConditionDSL"

Model:
	expression=Expression;

Expression:
	CompositeExpression;

CompositeExpression returns Expression:
	PrimaryExpression (({AND.left=current} '&&' | {OR.left=current} '||') right=PrimaryExpression)*;

PrimaryExpression returns Expression:
	{PrimaryExpression} ('(' e=Expression ')' |
	 name=ID Operator INT | FLOAT | STRING) |
	 Constant;

Constant:
	value = '.';

FLOAT:
	INT '.' INT;

Operator:
	('>' | '<' | '==' | '!=' | '<=' | '>=');

error(10):  internal error: Can't get property indirectDelegates using method get/isIndirectDelegates from org.antlr.tool.Grammar instance : java.lang.NullPointerException