Java Web site development Common failure summary

"One, server or tool pack defects"

1, velocity1.6.1 misuse HashMap lead to death cycle

Http://code.alibabatech.com/blog/experience_555/sun-jdk-hashmap-get-analysis-of-the-illegal-use-of-the-hang.html

2, jboss4.2.3 application of data disorder

http://blog.csdn.net/axman/article/details/5694212

3, xstream1.1.2 use String.intern to do cache caused perm area overflow

http://jira.codehaus.org/browse/XSTR-395

4, IE under the post way to submit AJAX requests, may result in data loss

http://blog.csdn.net/axman/article/details/7008515

Similarly, httpclient4.0.1 also has this problem.

http://dongliu84.appspot.com/post/537142

5, jboss4.0.5 using WebappClassLoader led to the performance of RMI decline

Http://www.neverevernote.com/?p=90

6, jdk6u26, using cmsrefproctaskproxy cause the application to stop the corresponding

http://coderplay.iteye.com/blog/1709338

7, Maven2 use release dependency, the compilation speed slows down

http://blog.csdn.net/whubrian/article/details/8544379

8. Oracle JDBC Driver v10.2.0.1, BULK insert lost data

Http://forums.oracle.com/forums/thread.jspa?threadID=970315&tstart=75

Http://jaykhimani.blogspot.com/2009/10/problem-with-ojdbc-14-preparedstatement.html

https://issues.apache.org/jira/browse/DERBY-428

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"Second, improper use"

1, repeatedly create XStream instances, resulting in high load

Http://stackoverflow.com/questions/10956154/xstream-creating-classes-and-causing-painful-permgen-collections

Http://aprilsoft.cn/blog/post/309.html

2, Speak SimpleDateFormat variable declared as static variable

3, new StringBuilder (int)

http://blog.csdn.net/axman/article/details/7086339

4, Copyonwritearraylist Trigger Oom

http://blog.csdn.net/axman/article/details/6826074

5,

http://blog.csdn.net/axman/article/details/6360707

6, Deflater class is not immediately closed after use, resulting in decreased performance

http://blog.csdn.net/axman/article/details/5591301

7, repeated call Font.createfont cause navtive memory leak

Http://aprilsoft.cn/blog/post/295.html '

8, repeat switch Netty nioclientsocketchannelfactory lead to direct memory leakage

Http://code.alibabatech.com/blog/experience_1348/netty-nio-direct-memory-leak.html

9, Hessian serialization does not set serializerfactory performance problems

Http://code.alibabatech.com/blog/experience_1089/hessian-set-serializerfactory-performance.html

10, JK set timeout too short to cause the server to return 502

http://blog.csdn.net/madding/article/details/7708326

11, the JDK linkedblockingqueue memory leak problem

http://sesame.iteye.com/blog/428026

12, Apache Oro use attention to detail (concurrency issues)

http://agapple.iteye.com/blog/1682858

"Three, Funny class"

1. JDK version upgrade causes Eclipse to fail to start

2, JDK read wrong hsperfdata directory, causing JPS to find the wrong process

http://blog.csdn.net/axman/article/details/6202198

"Four, other"

1, a high load of the process analysis, very valuable

http://blog.csdn.net/axman/article/details/7104819

2, template circular reference fault diagnosis

http://blog.csdn.net/axman/article/details/7730918

3, diagnostic online fault common tools

Http://code.alibabatech.com/blog/experience_1014/design-for-dummy.html

4, Fault summary

Http://hi.baidu.com/dyyx007/item/cded90151a9a9c473b176e54