StackOverflowError异常处理

2023-03-20 18:11| 来源: 网络整理| 查看: 265

在java虚拟机规范中，虚拟机栈和本地方法栈都会出现StackOverflowError和OutofMemoryError，程序计数器是java虚拟机中唯一一块不会产生error的内存区域，StackOverflowError代表的是，当栈深度超过虚拟机分配给线程的栈大小时就会出现此error，OutofMemoryError代表的是，当再申请新的内存时，虚拟机分配给线程的内存大小中无法再分配新的内存，就会出现此error。

现象：对象互相嵌套设置出现StackOverflowError异常

对象A：

package com.test; import com.wordnik.swagger.annotations.ApiModel; import com.wordnik.swagger.annotations.ApiModelProperty; import java.io.Serializable; import java.util.List; /** * test-manager * Created by xian.juanjuan on 2017-5-11 16:25. */ @ApiModel(description = "test-manager Created by xian.juanjuan on 2017-5-11 16:25.") public class Student implements Serializable{ private static final long serialVersionUID = -4895104060364320456L; /** * 用户ID */ @ApiModelProperty(value = "用户ID") private String userId; /** * 用户名 */ @ApiModelProperty(value = "用户名") private String userName; /** * 分数 */ @ApiModelProperty(value = "分数") private List scores; /** * 获取用户ID */ public String getUserId() { return this.userId; } /** * 设置用户ID */ public void setUserId(String userId) { this.userId = userId; } /** * 获取用户名 */ public String getUserName() { return this.userName; } /** * 设置用户名 */ public void setUserName(String userName) { this.userName = userName; } /** * 获取分数 */ public List getScores() { return this.scores; } /** * 设置分数 */ public void setScores(List scores) { this.scores = scores; } }

对象B：

package com.test; import com.wordnik.swagger.annotations.ApiModel; import com.wordnik.swagger.annotations.ApiModelProperty; import java.io.Serializable; /** * test-manager * Created by xian.juanjuan on 2017-5-11 16:25. */ @ApiModel(description = "test-manager Created by xian.juanjuan on 2017-5-11 16:25.") public class Score implements Serializable { private static final long serialVersionUID = -6345327076401038020L; /** * 分数 */ @ApiModelProperty(value = "分数") private String subject; /** * 科目 */ @ApiModelProperty(value = "科目") private double score; /** * 学生信息 */ @ApiModelProperty(value = "学生信息") private Student student; /** * 获取分数 */ public String getSubject() { return this.subject; } /** * 设置分数 */ public void setSubject(String subject) { this.subject = subject; } /** * 获取科目 */ public double getScore() { return this.score; } /** * 设置科目 */ public void setScore(double score) { this.score = score; } /** * 获取学生信息 */ public Student getStudent() { return this.student; } /** * 设置学生信息 */ public void setStudent(Student student) { this.student = student; } }

测试

package com.test; import com.alibaba.fastjson.JSONObject; import java.util.ArrayList; import java.util.List; /** * test-manager * Created by xian.juanjuan on 2017-5-11 16:25. */ public class Test { public static void main(String[] args){ Student student = new Student(); student.setUserId("001"); student.setUserName("小神经"); Score score = new Score(); score.setSubject("语文"); score.setScore(100); score.setStudent(student); // TODO score入库 List scores = new ArrayList(); scores.add(score); student.setScores(scores); //TODO student入库 System.out.print("运行完毕，学生信息为："+ JSONObject.toJSONString(student)); } }

运行结果：

"C:\Program Files\Java\jdk1.8.0_71\bin\java" -Didea.launcher.port=7532 "-Didea.launcher.bin.path=D:\soft\IntelliJ IDEA 2016.1.1\bin" -classpath C:\Users\xian.juanjuan\AppData\Local\Temp\classpath92.jar -Dfile.encoding=UTF-8 com.intellij.rt.execution.application.AppMain com.jyall.goods.product.service.Test 运行完毕，学生信息为：{"scores":[{"score":100,"student":{"$ref":"$"},"subject":"语文"}],"userId":"001","userName":"小神经"} Process finished with exit code 0

debug看运行过程中的参数信息：

score和student之间出现循环赋值，如果这里的对象属性比较多的时候，这种循环调用之后会导致该线程的堆栈异常，最终导致StackOverflowError异常；如何避免这种情况发生呢？可以克隆或者新建对象：

例如：

package com.jyall.goods.product.service; import com.alibaba.fastjson.JSONObject; import org.springframework.beans.BeanUtils; import java.util.ArrayList; import java.util.List; /** * goods-main-manager * Created by xian.juanjuan on 2017-5-11 16:25. */ public class Test { public static void main(String[] args){ Student student = new Student(); student.setUserId("001"); student.setUserName("小神经"); Score score = new Score(); score.setSubject("语文"); score.setScore(100); //避免循环调用出现StackOverflowError异常，这里用临时对象studentTemp Student studentTemp = new Student(); BeanUtils.copyProperties(student,studentTemp); score.setStudent(studentTemp); // TODO score入库 List scores = new ArrayList(); scores.add(score); student.setScores(scores); //TODO student入库 System.out.print("运行完毕，学生信息为："+ JSONObject.toJSONString(student)); } } 互相嵌套过程中不会出现死循环现象~

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