Arquivo Discussoes de Programacao e Tecnologia Pessoal gostaria de saber como faço para aumentar o limite de conexões no Tomcat4?
Tenho uma aplicação na web e frequentemente está ocorendo a seguinte exeção:ConnectionLimitReachedException, suponho que seja no tomcat porque existe uma outra aplicação igual a essa em coldfusion que não dá problema.
Desde já agradeço.
André
Bom, não vou cair no mérito de como você comparou a aplicação CF à Java, mas vamos lá:
1 - Tem algum JDBC na parada? Algum DataSource?
2 - Tem algum outro recurso no ser server.xml?
3 - Se 1 e 2 falharem, posta teu server.xml
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Essa aplicações, tem mais de 150 conexões simultaneas!!! Não uso JDBC e nem data sorce.
<?xml version=‘1.0’ encoding=‘utf-8’?>
<Server className=“org.apache.catalina.core.StandardServer” debug=“0” port=“8005” shutdown=“SHUTDOWN”>
<Listener className=“org.apache.catalina.mbeans.ServerLifecycleListener” debug=“0” jsr77Names=“false”/>
<Listener className=“org.apache.catalina.mbeans.GlobalResourcesLifecycleListener” debug=“0”/>
<GlobalNamingResources>
<Environment name=“simpleValue” override=“true” type=“java.lang.Integer” value=“30”/>
<Resource auth=“Container” description=“User database that can be updated and saved” name=“UserDatabase” scope=“Shareable” type=“org.apache.catalina.UserDatabase”/>
<ResourceParams name=“UserDatabase”>
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>
<Service className=“org.apache.catalina.core.StandardService” debug=“0” name=“Tomcat-Standalone”>
<Connector className=“org.apache.coyote.tomcat4.CoyoteConnector” acceptCount=“100” bufferSize=“2048” compression=“off” connectionLinger="-1" connectionTimeout=“20000” connectionUploadTimeout=“300000” debug=“0” disableUploadTimeout=“true” enableLookups=“true” maxKeepAliveRequests=“100” maxProcessors=“1000” minProcessors=“5” port=“80” protocolHandlerClassName=“org.apache.coyote.http11.Http11Protocol” proxyPort=“0” redirectPort=“8443” scheme=“http” secure=“false” serverSocketTimeout=“0” tcpNoDelay=“true” tomcatAuthentication=“true” useURIValidationHack=“false”>
<Factory className=“org.apache.catalina.net.DefaultServerSocketFactory”/>
</Connector>
<Connector className=“org.apache.coyote.tomcat4.CoyoteConnector” acceptCount=“10” bufferSize=“2048” compression=“off” connectionLinger="-1" connectionTimeout=“0” connectionUploadTimeout=“300000” debug=“0” disableUploadTimeout=“false” enableLookups=“true” maxKeepAliveRequests=“100” maxProcessors=“75” minProcessors=“5” port=“8009” protocolHandlerClassName=“org.apache.jk.server.JkCoyoteHandler” proxyPort=“0” redirectPort=“8443” scheme=“http” secure=“false” serverSocketTimeout=“0” tcpNoDelay=“true” tomcatAuthentication=“true” useURIValidationHack=“false”>
<Factory className=“org.apache.catalina.net.DefaultServerSocketFactory”/>
</Connector>
<Engine className=“org.apache.catalina.core.StandardEngine” debug=“0” defaultHost=“localhost” mapperClass=“org.apache.catalina.core.StandardEngineMapper” name=“Standalone”>
<Host className=“org.apache.catalina.core.StandardHost” appBase=“webapps” autoDeploy=“true” configClass=“org.apache.catalina.startup.ContextConfig” contextClass=“org.apache.catalina.core.StandardContext” debug=“0” deployXML=“true” errorReportValveClass=“org.apache.catalina.valves.ErrorReportValve” liveDeploy=“true” mapperClass=“org.apache.catalina.core.StandardHostMapper” name=“localhost” unpackWARs=“true”>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Tomcat Administration Application” docBase="…/server/webapps/admin" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/admin" privileged=“true” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
<Logger className=“org.apache.catalina.logger.FileLogger” debug=“0” directory=“logs” prefix=“localhost_admin_log.” suffix=".txt" timestamp=“true” verbosity=“1”/>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Webdav Content Management” docBase="/opt/hpapache2/tomcat4/webapps/webdav" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/webdav" privileged=“false” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“true” debug=“0” displayName=“Tomcat Examples” docBase=“examples” mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/examples" privileged=“false” reloadable=“true” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
<Logger className=“org.apache.catalina.logger.FileLogger” debug=“0” directory=“logs” prefix=“localhost_examples_log.” suffix=".txt" timestamp=“true” verbosity=“1”/>
<Parameter name=“<a href="http://context.param.name">context.param.name</a>” override=“false” value=“context.param.value”/>
<Ejb home=“com.wombat.empl.EmployeeRecordHome” name=“ejb/EmplRecord” remote=“com.wombat.empl.EmployeeRecord” type=“Entity”/>
<Ejb description=“Example EJB Reference” home=“com.mycompany.mypackage.AccountHome” name=“ejb/Account” remote=“com.mycompany.mypackage.Account” type=“Entity”/>
<Environment name=“foo/name4” override=“true” type=“java.lang.Integer” value=“10”/>
<Environment name=“maxExemptions” override=“true” type=“java.lang.Integer” value=“15”/>
<Environment name=“minExemptions” override=“true” type=“java.lang.Integer” value=“1”/>
<Environment name=“foo/bar/name2” override=“true” type=“java.lang.Boolean” value=“true”/>
<Environment name=“name3” override=“true” type=“java.lang.Integer” value=“1”/>
<Environment name=“foo/name1” override=“true” type=“java.lang.String” value=“value1”/>
<LocalEjb description=“Example Local EJB Reference” home=“com.mycompany.mypackage.ProcessOrderHome” local=“com.mycompany.mypackage.ProcessOrder” name=“ejb/ProcessOrder” type=“Session”/>
<LocalEjb description=“Example Local EJB Reference” home=“com.mycompany.mypackage.ProcessOrderHome” local=“com.mycompany.mypackage.ProcessOrder” name=“ejb/ProcessOrder” type=“Session”/>
<Resource auth=“SERVLET” name=“jdbc/EmployeeAppDb” scope=“Shareable” type=“javax.sql.DataSource”/>
<Resource auth=“Container” name=“mail/Session” scope=“Shareable” type=“javax.mail.Session”/>
<ResourceParams name=“jdbc/EmployeeAppDb”>
<parameter>
<name>url</name>
<value>jdbc:HypersonicSQL:database</value>
</parameter>
<parameter>
<name>password</name>
<value></value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>org.hsql.jdbcDriver</value>
</parameter>
<parameter>
<name>username</name>
<value>sa</value>
</parameter>
</ResourceParams>
<ResourceParams name=“mail/Session”>
<parameter>
<name>mail.smtp.host</name>
<value>localhost</value>
</parameter>
</ResourceParams>
<ResourceLink global=“simpleValue” name=“linkToGlobalResource” type=“java.lang.Integer”/>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Tomcat Documentation” docBase="/opt/hpapache2/tomcat4/webapps/tomcat-docs" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/tomcat-docs" privileged=“false” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
g.apache.catalina.util.CharsetMapper" cookies=“true” crossContext=“false” debug=“0” displayName=“Tomcat Documentation” docBase="/opt/hpapache2/tomcat4/webapps/tomcat-docs" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/tomcat-docs" privileged=“false” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Sistema de Rastreamento de Objetos” docBase="/opt/hpapache2/tomcat4/webapps/rastreamento" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/rastreamento" privileged=“false” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Welcome to Tomcat” docBase="/opt/hpapache2/tomcat4/webapps/ROOT" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="" privileged=“false” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Sistema de Rastreamento de Objetos” docBase="/opt/hpapache2/tomcat4/webapps/rastreamento2" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/rastreamento2" privileged=“false” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
</Context>
<Context className=“org.apache.catalina.core.StandardContext” cachingAllowed=“true” charsetMapperClass=“org.apache.catalina.util.CharsetMapper” cookies=“true” crossContext=“false” debug=“0” displayName=“Tomcat Manager Application” docBase="…/server/webapps/manager" mapperClass=“org.apache.catalina.core.StandardContextMapper” path="/manager" privileged=“true” reloadable=“false” swallowOutput=“false” useNaming=“true” wrapperClass=“org.apache.catalina.core.StandardWrapper”>
<ResourceLink global=“UserDatabase” name=“users” type=“org.apache.catalina.UserDatabase”/>
</Context>
<Logger className=“org.apache.catalina.logger.FileLogger” debug=“0” directory=“logs” prefix=“localhost_log.” suffix=".txt" timestamp=“true” verbosity=“1”/>
</Host>
<Logger className=“org.apache.catalina.logger.FileLogger” debug=“0” directory=“logs” prefix=“catalina_log.” suffix=".txt" timestamp=“true” verbosity=“1”/>
<Realm className=“org.apache.catalina.realm.UserDatabaseRealm” debug=“0” resourceName=“UserDatabase” validate=“true”/>
</Engine>
</Service>
</Server>
A aplicação que eu uso é
displayName=“Sistema de Rastreamento de Objetos” docBase="/opt/hpapache2/tomcat4/webapps/rastreamento"
Uhm…muda te connector nos erverl.xml [se teu adminsitrador deixar 
]
Dá uma olhada na referência, e vê o que vc pode otimizar. Acho que acceptCount deve resolver teu problema…
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