The java demo in the instruction manual will fail to execute

[YesOrNo828]

Version: 3.3.3
Junit Test Execute failed:

    @Test
    public void testJava() throws Exception {

        ExpressRunner runner = new ExpressRunner();
        String express = "n = 10;\n" +
                "sum = 0;\n" +
                "for(i = 0; i < n; i++) {\n" +
                "   sum = sum + i;\n" +
                "}\n" +
                "return sum;";
        Object r = runner.execute(express, null, null, true, false);
        System.out.println(r);
    }

the exact exception:

com.ql.util.express.exception.QLBizException: run QlExpress Exception at line 1 :

	at com.ql.util.express.instruction.detail.InstructionOperator.execute(InstructionOperator.java:38)
	at com.ql.util.express.InstructionSet.executeInnerOriginalInstruction(InstructionSet.java:200)
	at com.ql.util.express.InstructionSet.execute(InstructionSet.java:164)
	at com.ql.util.express.InstructionSetRunner.execute(InstructionSetRunner.java:64)
	at com.ql.util.express.InstructionSetRunner.execute(InstructionSetRunner.java:55)
	at com.ql.util.express.InstructionSetRunner.executeOuter(InstructionSetRunner.java:19)
	at com.ql.util.express.ExpressRunner.executeReentrant(ExpressRunner.java:655)
	at com.ql.util.express.ExpressRunner.executeInner(ExpressRunner.java:641)
	at com.ql.util.express.ExpressRunner.execute(ExpressRunner.java:629)
	at com.ql.util.express.self.TestQuickStart.testJava(TestQuickStart.java:36)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
	at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
	at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
	at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
	at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
	at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
	at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
	at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
	at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
	at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
	at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
	at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:130)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
	at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: 没有定义局部变量：n,而且没有全局上下文
	at com.ql.util.express.instruction.opdata.OperateDataAttr.setObject(OperateDataAttr.java:92)
	at com.ql.util.express.instruction.op.OperatorEvaluate.executeInner(OperatorEvaluate.java:40)
	at com.ql.util.express.instruction.op.OperatorEvaluate.executeInner(OperatorEvaluate.java:22)
	at com.ql.util.express.instruction.op.OperatorBase.execute(OperatorBase.java:56)
	at com.ql.util.express.instruction.detail.InstructionOperator.execute(InstructionOperator.java:32)
	... 32 more
Caused by: java.lang.RuntimeException: 没有定义局部变量：n,而且没有全局上下文
	at com.ql.util.express.InstructionSetContext.put(InstructionSetContext.java:143)
	at com.ql.util.express.instruction.opdata.OperateDataAttr.setObject(OperateDataAttr.java:90)
	... 36 more


Process finished with exit code 255

But execute successfully:

    @Test
    public void testJavaType() throws Exception {

        ExpressRunner runner = new ExpressRunner();
        String express = "int n = 10;\n" +
                "int sum = 0;\n" +
                "for(int i = 0; i < n; i++) {\n" +
                "   sum = sum + i;\n" +
                "}\n" +
                "return sum;";
        Object r = runner.execute(express, null, null, true, false);
        System.out.println(r);
    }

Maybe we should modify the guideline in the README.md