loadrunner:java.lang.OutOfMemoryError: Java heap space 问题解决

loadrunner:java.lang.OutOfMemoryError: Java heap space 问题解决

问题原因：
一次测试需要想服务器中传递json串。
串内容为：

{"m_id_1008":<span style="white-space:pre"></span>{"prop_1":<span style="white-space:pre"></span>{"vColor":"#bdb76b","pId":"183","pName":"颜色","vName":"深卡其布色","vPicture":"","vDefault":"","vId":"1008"},"m_id":"1008","prop_2":[{"c_id":"1121","property":{"orgPrice":"2","curPrice":"0.6","shelf":"","activeProductCount":"9990004","sellerClassNum":""},"pId":"182","pName":"身高","vName":"110cm","vPicture":"","vDefault":"","vId":"1121"},{"c_id":"1122","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"120cm","vPicture":"","vDefault":"","vId":"1122"},{"c_id":"1123","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"19990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"130cm","vPicture":"","vDefault":"","vId":"1123"},{"c_id":"1124","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990009","sellerClassNum":""},"pId":"182","pName":"身高","vName":"140cm","vPicture":"","vDefault":"","vId":"1124"},{"c_id":"1125","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"150cm","vPicture":"","vDefault":"","vId":"1125"}]},"m_id_1014":{"prop_1":{"vColor":"#dda0dd","pId":"183","pName":"颜色","vName":"紫罗兰","vPicture":"","vDefault":"","vId":"1014"},"m_id":"1014","prop_2":[{"c_id":"1121","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"19990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"110cm","vPicture":"","vDefault":"","vId":"1121"},{"c_id":"1122","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990008","sellerClassNum":""},"pId":"182","pName":"身高","vName":"120cm","vPicture":"","vDefault":"","vId":"1122"},{"c_id":"1123","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990007","sellerClassNum":""},"pId":"182","pName":"身高","vName":"130cm","vPicture":"","vDefault":"","vId":"1123"},{"c_id":"1124","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"140cm","vPicture":"","vDefault":"","vId":"1124"},{"c_id":"1125","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990009","sellerClassNum":""},"pId":"182","pName":"身高","vName":"150cm","vPicture":"","vDefault":"","vId":"1125"}]},"m_id_1016":{"prop_1":{"vColor":"#ff0000","pId":"183","pName":"颜色","vName":"红色","vPicture":"","vDefault":"","vId":"1016"},"m_id":"1016","prop_2":[{"c_id":"1121","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"19990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"110cm","vPicture":"","vDefault":"","vId":"1121"},{"c_id":"1122","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990007","sellerClassNum":""},"pId":"182","pName":"身高","vName":"120cm","vPicture":"","vDefault":"","vId":"1122"},{"c_id":"1123","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"130cm","vPicture":"","vDefault":"","vId":"1123"},{"c_id":"1124","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9990009","sellerClassNum":""},"pId":"182","pName":"身高","vName":"140cm","vPicture":"","vDefault":"","vId":"1124"},{"c_id":"1125","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"999000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"150cm","vPicture":"","vDefault":"","vId":"1125"}]},"m_id_1017":{"prop_1":{"vColor":"#008000","pId":"183","pName":"颜色","vName":"绿色","vPicture":"","vDefault":"","vId":"1017"},"m_id":"1017","prop_2":[<span style="white-space:pre"></span>{"c_id":"1121","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"1999000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"110cm","vPicture":"","vDefault":"","vId":"1121"},{"c_id":"1122","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"999000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"120cm","vPicture":"","vDefault":"","vId":"1122"},{"c_id":"1123","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9999000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"130cm","vPicture":"","vDefault":"","vId":"1123"},{"c_id":"1124","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"9999000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"140cm","vPicture":"","vDefault":"","vId":"1124"},{"c_id":"1125","property":{"orgPrice":"1","curPrice":"0.6","shelf":"","activeProductCount":"999000","sellerClassNum":""},"pId":"182","pName":"身高","vName":"150cm","vPicture":"","vDefault":"","vId":"1125"}]}}

需要随机生成pid的个数和cid的个数。于是使用了一个简单的双层for循环来实现json串。格式如下：
for(i=0;i<Random;i++)
{
m_id...
prop...
vColor...
m_id...
prop...
for(j=0;j<Random;j++)
{
"c_id"..
}
}

然后将生成的字符串拼装，传递给一个变量，传递到被测程序接口中。（很简单吧。）

第一遍程序（LR脚本）：

String test="",test1="",test2="",test3="";String a1,a2,a3,a4,a5,a6,a7,a8,a9;String new_s; int i,j;    a1="{";//    a2=" \"m_id_100"+i+"\": ";    a3="{\"prop_1\":";//    a4="{\"vColor\":\"#bdb76b\",\"pId\":\"183\",\"pName\":\"颜色\",\"vName\":\"深卡其布色\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"100"+i+"\"},   ";//          a5="      \"m_id\": 100"+i+"," ;    a6="      \"prop_2\": [" ;//    a7="{\"c_id\":\"112"+j+"\",\"property\":{\"orgPrice\":\"80\",\"curPrice\":\"40\",\"shelf\":\"\",\"activeProductCount\":\"9990004\",\"sellerClassNum\":\"\"},\"pId\":\"182\",\"pName\":\"身高\",\"vName\":\"110cm\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"112"+j+"\"},";    a8="]},";    a9="}";    for(i=0;i<Integer.parseInt("<INum>");i++)//    for(i=0;i<1;i++)    {    a2=" \"m_id_100"+i+"\": ";    a4="{\"vColor\":\"#bdb76b\",\"pId\":\"183\",\"pName\":\"颜色\",\"vName\":\"深卡其布色\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"100"+i+"\"},   ";    a5="      \"m_id\": 100"+i+"," ;    test1="";    for(j=0;j<Integer.parseInt("<JNum>");j++)//    for(j=0;j<2;j++){                    a7="{\"c_id\":\"112"+j+"\",\"property\":{\"orgPrice\":\"<OrgPrice>\",\"curPrice\":\""+Integer.toString(Integer.parseInt("<OrgPrice>")/2)+"\",\"shelf\":\"\",\"activeProductCount\":\"9990004\",\"sellerClassNum\":\"\"},\"pId\":\"182\",\"pName\":\"身高\",\"vName\":\"110cm\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"112"+j+"\"},";    test1=test1+a7;}    test2=a2+a3+a4+a5+a6+test1.substring(0,test1.length()-2)+a8;    test3=test3+test2;    }//    lr.error_message(">>>>>"+test3);    test=a1+test3.substring(0,test3.length()-1)+a9;      new_s=test; //  lr.error_message(">>>>>"+new_s);

成绩斐然，脚本实现了需要的功能。
在执行过程中并发2000用户，不设置集合点，不持续，速度处理很快，貌似脚本没有问题。感觉良好。
但是，性能测试，怎能不加集合点、不持续30分钟以上呢？
先做个简单的，100user+30M
结果在压测的过程中发现，刚执行没有问题，当执行5分钟以上时，LR报错，提示java.lang.OutOfMemoryError: Java heap space。
百度之。。。
修改脚本的环境变量设置
【run-time setting】——【javavm】
选择
use specified JDK 设置JDK路径
additional VM parameters 设置JDK内存：-Xmx256M -Xms256M

我的机器是由4G可用内存，设置过高会提示：
Notify: Error occurred during initialization of VM

继续：100user+30M
情况有所好转，但依然报错：java.lang.OutOfMemoryError: Java heap space。

看来设置是治标治本，必须从脚本中解决问题。（大家尝试下能从上面发现问题吗）

第二遍程序（LR脚本）：

   int i,j;StringBuilder a1 = new StringBuilder();StringBuilder a2 = new StringBuilder();StringBuilder a3 = new StringBuilder();StringBuilder a4 = new StringBuilder();StringBuilder a5 = new StringBuilder();StringBuilder a6 = new StringBuilder();StringBuilder a7 = new StringBuilder();StringBuilder a8 = new StringBuilder();StringBuilder a9 = new StringBuilder();StringBuilder test1 = new StringBuilder();StringBuilder test2 = new StringBuilder();String new_s;    a1.append("{");//    a2=" \"m_id_100"+i+"\": ";    a3.append("{\"prop_1\":");//    a4="{\"vColor\":\"#bdb76b\",\"pId\":\"183\",\"pName\":\"颜色\",\"vName\":\"深卡其布色\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"100"+i+"\"},   ";//          a5="      \"m_id\": 100"+i+"," ;    a6.append("      \"prop_2\": [" );//    a7="{\"c_id\":\"112"+j+"\",\"property\":{\"orgPrice\":\"80\",\"curPrice\":\"40\",\"shelf\":\"\",\"activeProductCount\":\"9990004\",\"sellerClassNum\":\"\"},\"pId\":\"182\",\"pName\":\"身高\",\"vName\":\"110cm\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"112"+j+"\"},";    a8.append("]},");    a9.append("}");    for(i=0;i<Integer.parseInt("<INum>");i++)    {    a2 =new StringBuilder();    a2.append(" \"m_id_100").append(i).append("\": ");    a4 =new StringBuilder();    a4.append("{\"vColor\":\"#bdb76b\",\"pId\":\"183\",\"pName\":\"颜色\",\"vName\":\"深卡布色\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"100").append(i).append("\"},   ");    a5 =new StringBuilder();    a5.append("      \"m_id\": 100").append(i).append(",");    test1 =new StringBuilder();    for(j=0;j<Integer.parseInt("<JNum>");j++){    a7 =new StringBuilder();                    a7.append("{\"c_id\":\"112").append(j).append("\",\"property\":{\"orgPrice\":\"<OrgPrice>\",\"curPrice\":\"").append(Integer.toString(Integer.parseInt("<OrgPrice>")/2)).append("\",\"shelf\":\"\",\"activeProductCount\":\"9990004\",\"sellerClassNum\":\"\"},\"pId\":\"182\",\"pName\":\"身高\",\"vName\":\"110cm\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"112").append(j).append("\"},");}test1.append(a7);test2.append(a2).append(a3).append(a4).append(a5).append(a6).append(test1.substring(0, test1.length()-2)).append(a8);    }    //lr.error_message("test2>>>>>"+test2);    new_s=a1.append(test2.substring(0,test2.length()-1)).append(a9).toString();  //  lr.error_message("new_s>>>>>"+new_s);

不知道是否有同学能够理解使用append所能够解决的问题。
test2=a2+a3+a4+a5+a6+test1.substring(0,test1.length()-2)+a8;
test2.append(a2).append(a3).append(a4).append(a5).append(a6).append(test1.substring(0, test1.length()-2)).append(a8);

它们的区别在哪里。

当然调整脚本后继续100user+30M。
可惜过程依然报错：java.lang.OutOfMemoryError: Java heap space。

为什么？透过现象看本质。

我被折磨的3个小时，让脑袋放空，然后回来看这个代码。

第三遍程序（LR脚本）：

    int i,j;StringBuilder a1 = new StringBuilder();StringBuilder a2 = new StringBuilder();StringBuilder a3 = new StringBuilder();StringBuilder a4 = new StringBuilder();StringBuilder a5 = new StringBuilder();StringBuilder a6 = new StringBuilder();StringBuilder a7 = new StringBuilder();StringBuilder a8 = new StringBuilder();StringBuilder a9 = new StringBuilder();StringBuilder test1 = new StringBuilder();StringBuilder test2 = new StringBuilder();String new_s;    a1.append("{");//    a2=" \"m_id_100"+i+"\": ";    a3.append("{\"prop_1\":");//    a4="{\"vColor\":\"#bdb76b\",\"pId\":\"183\",\"pName\":\"颜色\",\"vName\":\"深卡其布色\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"100"+i+"\"},   ";//          a5="      \"m_id\": 100"+i+"," ;    a6.append("      \"prop_2\": [" );//    a7="{\"c_id\":\"112"+j+"\",\"property\":{\"orgPrice\":\"80\",\"curPrice\":\"40\",\"shelf\":\"\",\"activeProductCount\":\"9990004\",\"sellerClassNum\":\"\"},\"pId\":\"182\",\"pName\":\"身高\",\"vName\":\"110cm\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"112"+j+"\"},";    a8.append("]},");    a9.append("}");    for(i=0;i<Integer.parseInt("<INum>");i++)    {    a2 =new StringBuilder();    a2.append(" \"m_id_100").append(i).append("\": ");    a4 =new StringBuilder();    a4.append("{\"vColor\":\"#bdb76b\",\"pId\":\"183\",\"pName\":\"颜色\",\"vName\":\"深卡布色\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"100").append(i).append("\"},   ");    a5 =new StringBuilder();    a5.append("      \"m_id\": 100").append(i).append(",");    test1 =new StringBuilder();    for(j=0;j<Integer.parseInt("<JNum>");j++){    a7 =new StringBuilder();                    a7.append("{\"c_id\":\"112").append(j).append("\",\"property\":{\"orgPrice\":\"<OrgPrice>\",\"curPrice\":\"").append(Integer.toString(Integer.parseInt("<OrgPrice>")/2)).append("\",\"shelf\":\"\",\"activeProductCount\":\"9990004\",\"sellerClassNum\":\"\"},\"pId\":\"182\",\"pName\":\"身高\",\"vName\":\"110cm\",\"vPicture\":\"\",\"vDefault\":\"\",\"vId\":\"112").append(j).append("\"},");}test1.append(a7);test2.append(a2).append(a3).append(a4).append(a5).append(a6).append(test1.substring(0, test1.length()-2)).append(a8);    }    //lr.error_message("test2>>>>>"+test2);    new_s=a1.append(test2.substring(0,test2.length()-1)).append(a9).toString();  //  lr.error_message("new_s>>>>>"+new_s);lr.start_transaction("新建商品");   .....lr.end_transaction("新建商品", lr.AUTO);a1 = null;    a2 = null;    a3 = null;    a4 = null;    a5 = null;    a6 = null;    a7 = null;    a8 = null;    a9 = null;    test1 = null; test2 = null; new_s = null;

问题解决。