如果有两个会话,每个会话都持有另一个会话想要的资源,此时就会发生死锁.用下面实验来说明死锁的产生原因和解决办法.SESSION1:SQL> create table t2 as select * from emp;SQL> select * from t2 where empno=7369; EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO---------- ---…
HttpClient的CircularRedirectException异常原因及解决办法 这两天在使用我自己爬虫抓取网页的时候总是出现 org.apache.http.client.ClientProtocolException at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:909) at org.apache.http.impl.client.AbstractHttpClie…
在StackOverflow得到最终原因及解决办法 http://stackoverflow.com/questions/16424117/php-unable-to-load-php-curl-dll-extension libeay32.dll and ssleay32.dll have to be path-accessible for php_curl.dll loading to succeed. Copying them into System32 (or even into the…
在eclipse中tomcat发布项目时,偶尔出现了以下情况: publishing to tomcat v7.0 services at localhost has encountered a problem ...could not delete...May be locked by another process 重启eclipse也没有用.百度后发现原因及解决办法: 原因:默认的设置是文件修改后立即发布,这样的设置是在你每个保存文件时都会触发,如果tomcat已经在运行,这样频繁的操作也…