Workaround for HTTP 403 error (forbidden) during Eclipse development

1. Open the project's page as follows:

Connection has been abandoned pooledconnection and Too Many connections can be found from the Tomcat log .

2017-08-03 18:28:48.022 WARN 6396---[o-8080-exec-170] o.a.tomcat.jdbc.pool.connectionpool:Connection has been abandoned pooledconnection[[Email protected]]:java.lang.exceptionat Org.apache.tomcat.jdbc.pool.ConnectionPool.getThreadDump ( connectionpool.java:1065) at Org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection (connectionpool.java:707 ) at Org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection (connectionpool.java:634) at Org.apache.tomcat.jdbc.pool.ConnectionPool.init (connectionpool.java:488) at Org.apache.tomcat.jdbc.pool.connectionpool.<init> (connectionpool.java:144) at Org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool (datasourceproxy.java:116) at Org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool (datasourceproxy.java:103) at Org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection (datasourceproxy.java:127) ... at Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (applicationfilterchain.java:239) at Org.apache.catalina.core.ApplicationFilterChain.doFilter (applicationfilterchain.java:206) at Org.apache.catalina.core.StandardWrapperValve.invoke (standardwrappervalve.java:212) at Org.apache.catalina.core.StandardContextValve.invoke (standardcontextvalve.java:106) at Org.apache.catalina.core.StandardHostValve.invoke (standardhostvalve.java:141) at Org.apache.catalina.valves.ErrorReportValve.invoke (errorreportvalve.java:79) at Org.apache.catalina.valves.AbstractAccessLogValve.invoke (abstractaccesslogvalve.java:616) at Org.apache.catalina.core.StandardEngineValve.invoke (standardenginevalve.java:88) at Org.apache.catalina.connector.CoyoteAdapter.service (coyoteadapter.java:521) at Org.apache.coyote.http11.AbstractHttp11Processor.process (abstracthttp11processor.java:1096) at Org.apache.coyote.abstractprotocol$abstractconnectionhandler.process (abstractprotocol.java:674) at Org.apache.tomcat.util.net.nioendpoint$socketprocessor.dorun (nioendpoint.java:1500) at Org.apache.tomcat.util.net.nioendpoint$socketprocessor.run (nioendpoint.java:1456) at Java.util.concurrent.ThreadPoolExecutor.runWorker (threadpoolexecutor.java:1142) at Java.util.concurrent.threadpoolexecutor$worker.run (Threadpoolexecutor.java:617) at Org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run (TaskThread.java:61) at Java.lang.Thread.run (thread.java:745) 2017-08-03 18:28:48 ERROR [com.xxx.yyy.a.b]--<too many connections>  Com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException:too many connections  At Sun.reflect.GeneratedConstructorAccessor295.newInstance (Unknown Source) at Sun.reflect.DelegatingConstructorAccessorImpl.newInstance (delegatingconstructoraccessorimpl.java:45) at Java.lang.reflect.Constructor.newInstance (constructor.java:422) at Com.mysql.jdbc.Util.handleNewInstance ( util.java:409) at Com.mysql.jdbc.Util.getInstance (util.java:384) at Com.mysql.jdbc.SQLError.createSQLException ( sqlerror.java:1015) at Com.mysql.jdbc.MysqlIO.checkErrorPacket (mysqlio.java:3562) at Com.mysql.jdbc.MysqlIO.checkErrorPacket (mysqlio.java:3494) at Com.mysql.jdbc.MysqlIO.checkErrorPacket ( mysqlio.java:920) at com.mysql.jdbc.MysqlIO.secureAuth411 (mysqlio.java:4000) at Com.mysql.jdbc.MysqlIO.doHandshake (mysqlio.java:1285) at Com.mysql.jdbc.ConnectionImpl.createNewIO (connectionimpl.java:2186) at Com.mysql.jdbc.connectionimpl.<init> (connectionimpl.java:787) at Com.mysql.jdbc.jdbc4connection.<init > (jdbc4connection.java:49) at Sun.reflect.GeneratedConstructorAccessor288.newInstance (Unknown Source) at Sun.Reflect. Delegatingconstructoraccessorimpl.newinstance (delegatingconstructoraccessorimpl.java:45) at Java.lang.reflect.Constructor.newInstance (constructor.java:422) at Com.mysql.jdbc.Util.handleNewInstance ( util.java:409) at Com.mysql.jdbc.ConnectionImpl.getInstance (connectionimpl.java:357) at Com.mysql.jdbc.NonRegisteringDriver.connect (nonregisteringdriver.java:285) at Org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver (pooledconnection.java:278) at Org.apache.tomcat.jdbc.pool.PooledConnection.connect (pooledconnection.java:182) at Org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection (connectionpool.java:702) at Org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection (connectionpool.java:634) at Org.apache.tomcat.jdbc.pool.ConnectionPool.init (connectionpool.java:488) at Org.apache.tomcat.jdbc.pool.connectionpool.<init> (connectionpool.java:144) at Org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool (datasourceproxy.java:116) at Org.apache.tomcat.jdbc.pool.DataSourceProxy. CreatePool (datasourceproxy.java:103) at Org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection ( datasourceproxy.java:127) ... at Org.apache.catalina.core.ApplicationFilterChain.internalDoFilter ( applicationfilterchain.java:239) at Org.apache.catalina.core.ApplicationFilterChain.doFilter ( applicationfilterchain.java:206) at Org.apache.catalina.core.StandardWrapperValve.invoke ( standardwrappervalve.java:212) at Org.apache.catalina.core.StandardContextValve.invoke (Standardcontextvalve.java : 106) at Org.apache.catalina.core.StandardHostValve.invoke (standardhostvalve.java:141) at Org.apache.catalina.valves.ErrorReportValve.invoke (errorreportvalve.java:79) at Org.apache.catalina.valves.AbstractAccessLogValve.invoke (abstractaccesslogvalve.java:616) at Org.apache.catalina.core.StandardEngineValve.invoke (standardenginevalve.java:88) at Org.apache.catalina.connector.CoyoteAdapter.service (coyoteadapter.java:521) at Org.apache.coyote.http11.AbstractHttp11Processor.process (abstracthttp11processor.java:1096) AT Org.apache.coyote.abstractprotocol$abstractconnectionhandler.process (abstractprotocol.java:674) at Org.apache.tomcat.util.net.nioendpoint$socketprocessor.dorun (nioendpoint.java:1500) at Org.apache.tomcat.util.net.nioendpoint$socketprocessor.run (nioendpoint.java:1456) at Java.util.concurrent.ThreadPoolExecutor.runWorker (threadpoolexecutor.java:1142) at Java.util.concurrent.threadpoolexecutor$worker.run (threadpoolexecutor.java:617) at Org.apache.tomcat.util.threads.taskthread$wrappingrunnable.run (taskthread.java:61) at Java.lang.Thread.run ( thread.java:745)

2. Solution

Restart Eclipse and run the project again (CTRL+ALT+D). The main reason for this problem is that eclipse will automatically recompile the code when the code is saved, and you can easily get this HTTP 403 error if you modify the code again to save it.

Workaround for HTTP 403 error (forbidden) during Eclipse development