tomcat connection pool monitoring

Reprinted: 1. Problem DescriptionWebProgramIt was very fast at the beginning of Tomcat, but after a while it was found that the speed became very slow.Check log output and find exceptions as follows:Org. Apache. commons. DBCP. sqlnestedexception: cannot get a connection, pool exhausted, cause:Java. util. nosuchelementexception: timeout waiting for idle objectA

the ability to automatically reclaim idle connections.Steps to use:1, add jar package C3p0-0.9.1.2.jar, download location: http://www.oschina.net/p/c3p0, open source China has detailed. 2, write the configuration file c3p0-config.xml, file name fixed, can not be changed, "C3p0 Baidu Encyclopedia" has detailed configuration information, compared to the whole.default-config>//127.0.0.1:3306/test default-config>3. Writing tool classes Public classC3p0util {Private StaticCombopooleddatasource

Label:Tomcat used COMMONS-DBCP as the implementation of connection pooling in versions prior to 7.0, but there are some problems with DBCP:(1) DBCP is single-threaded, in order to ensure that the line Shuo plenary lock the entire connection pool(2) Poor performance of DBCP(3) DBCP is too complex, more than 60 classes, development lag.As a result, other high-perfo

Source: Monitoring user's online status based on connection pool monitoring component Druid implementationSource code: Http://www.zuidaima.com/share/1550463574248448.htmI'm going to share a code, too. Recently in the monitoring of users online status, handling the abnormal u

Configure the data source and connection pool in Tomcat and tomcat Data Source (1) Why do I need to configure the data source and connection pool? We know that every time the java program connects to the database, we need to reque

Tomcat in the previous version of 7.0 are using COMMONS-DBCP as a connection pool, but DBCP was criticized for the reasons: DBCP is single-threaded, in order to ensure that the line Cheng Ann Plenary lock the entire connection pool dbcp poor performance dbcp too complex, mor

DBCP Connection Pool configuration About DBCP Connection pool The specific use of the method also need to refer to: Click to open the link dbcp jar package Commons-dbpc.jar, Commons-collections.jar, commons-pool.jar download click to downloadc3p0 Connection

In general, the database connection pool is configured in Tomcat, and we constantly establish database connections. This is the case if the database connection is not closed.Common: cannot get a connection, pool exhaustedcannot ge

While (dbset. Next () {clob = (oracleresultset) dbset). getclob (1); clob. putstring (1, questioncontent ); Or If (RSS. Next () {clob = (clob) RSS. getclob (1); clob. putstring (1, allmobilecode );} If the connection pool is used for insertion, an error is returned. java. Lang. classcastexception: org. Apache. commons. DBCP. delegatingresultset (type conversion exception) When you operate in JDBC mode,

Tomcat creates a connection pool and writes helpDB connection methods. tomcathelpdb 1. sever configuration in tomcat Factory = "org. apache. tomcat. jdbc. pool. performancefactory" init

Spring configuration tomcat JDBC Pool database connection pool

long time, and if the setting is too small, the subsequent incoming request returns connection refused immediately.Third, thread pool executorThe executor element represents a thread pool in Tomcat, which can be shared by other components, and the component needs to specify that thread

long time, and if the setting is too small, the subsequent incoming request returns connection refused immediately.Third, thread pool executorThe executor element represents a thread pool in Tomcat, which can be shared by other components, and the component needs to specify that thread

the Accept queue), gets the requested data in the connection, generates the request, and invokes the servlet container to process the request ; return to response. In order to facilitate the following instructions, first clarify the relationship between the connection and the request: The connection is the TCP level (transport layer), the corresponding socket, t

connections. If the setting is too large, the subsequent incoming request waits a long time, and if the setting is too small, the subsequent incoming request returns connection refused immediately. third, thread pool executor The executor element represents a thread pool in Tomcat, which can be shared by other compone