com.ql.util.express.ExpressUtil#replaceString 方法存在空指针异常

[cysy-lli]

现象描述：

1. 设置了compareNullLessMoreAsFalse = true
2. 为==操作符设置了errorInfo（这里只是拿==操作符进行举例说明，其他操作符是一样的）
3. ==操作符左边使用实例方法调用（对比静态方法调用）
4. ==操作符左边操作数传的是null，右边操作数不为null
5. 调用ExpressRunner.execute方法，errorInfoList参数不为空

结果说明：

1. ==操作符左边使用的是实例方法调用时，封装errorInfo结果会报空指针异常
2. ==操作符左边使用的是静态方法调用时，运行结果正常，封装errorInfo结果正常

pom依赖：

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>QLExpress</artifactId>
    <version>3.3.4</version>
</dependency>

测试主类：

import com.ql.util.express.DefaultContext;
import com.ql.util.express.ExpressRunner;
import com.ql.util.express.config.QLExpressRunStrategy;

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) throws Exception {
//        testClassFunction();
        testServiceFunction();
    }

    private static void testClassFunction() throws Exception {
        QLExpressRunStrategy.setCompareNullLessMoreAsFalse(true);
        ExpressRunner runner = new ExpressRunner();
        DefaultContext<String, Object> context = new DefaultContext<String, Object>();
        context.put("a", null);
        context.put("b", 2);
        context.put("c", 3);

        runner.addFunctionOfClassMethod("取绝对值", Math.class.getName(), "abs", new String[] {"double"}, null);
        runner.addFunctionOfClassMethod("转换为大写", BeanExample.class.getName(), "upper", new String[] {"String"}, null);
        runner.addFunctionOfClassMethod("转换为小写", BeanExample.class.getName(), "lower", new String[] {"String"}, null);
        String express = "转换为小写(转换为大写(a)) == c;";
        List<String> errorList = new ArrayList<>();
        runner.getOperatorFactory().getOperator("==").setErrorInfo("$1等于$2");
        Object r = runner.execute(express, context, errorList, true, false);
        System.out.println(r);
    }

    private static void testServiceFunction() throws Exception {
        QLExpressRunStrategy.setCompareNullLessMoreAsFalse(true);
        ExpressRunner runner = new ExpressRunner();
        DefaultContext<String, Object> context = new DefaultContext<String, Object>();
        context.put("a", null);
        context.put("b", 2);
        context.put("c", 3);

        BeanServiceExample beanServiceExample = new BeanServiceExample();
        runner.addFunctionOfServiceMethod("upper", beanServiceExample, "upper", new String[] {"String"}, null);
        runner.addFunctionOfServiceMethod("lower", beanServiceExample, "lower", new String[] {"String"}, null);
        String express = "beanServiceExample = new org.example.BeanServiceExample(); return beanServiceExample.lower(beanServiceExample.upper(a)) == c;";
        List<String> errorList = new ArrayList<>();
        runner.getOperatorFactory().getOperator("==").setErrorInfo("$1等于$2");
        Object r = runner.execute(express, context, errorList, true, false);
        System.out.println(r);
    }
}

testServiceFunction方法报错空指针异常：

Exception in thread "main" 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 org.example.Main.testServiceFunction(Main.java:48)
	at org.example.Main.main(Main.java:13)
Caused by: java.lang.NullPointerException: Cannot invoke "Object.toString()" because "parameters[index]" is null
	at com.ql.util.express.ExpressUtil.replaceString(ExpressUtil.java:597)
	at com.ql.util.express.instruction.op.OperatorBase.execute(OperatorBase.java:61)
	at com.ql.util.express.instruction.detail.InstructionOperator.execute(InstructionOperator.java:32)
	... 10 more

BeanServiceExample：

package org.example;

public class BeanServiceExample {

    public String upper(String abc) {
        if (null == abc) {
            return null;
        }
        return abc.toUpperCase();
    }

    public String lower(String abc) {
        if (null == abc) {
            return null;
        }
        return abc.toLowerCase();
    }
    public boolean anyContains(String str, String searchStr) {
        char[] s = str.toCharArray();
        for (char c : s) {
            if (searchStr.contains(c+"")) {
                return true;
            }
        }
        return false;
    }
}

BeanExample：

public class BeanExample {
    public static String upper(String abc) {
        if (null == abc) {
            return null;
        }
        return abc.toUpperCase();
    }

    public static String lower(String abc) {
        if (null == abc) {
            return null;
        }
        return abc.toLowerCase();
    }
    public boolean anyContains(String str, String searchStr) {
        char[] s = str.toCharArray();
        for (char c : s) {
            if (searchStr.contains(c+"")) {
                return true;
            }
        }
        return false;
    }
}