Showing posts from August, 2014Show All

The classes shown below require explicit closure to release resources established at the database level. Connection objects leave database sessions open, and Statement and ResultSet objects leave cursors open at the database le…

OVERVIEW  Dead Connection Detection (DCD) is a feature of SQL*Net 2.1 and later, including Oracle Net8 and Oracle NET. DCD detects when a partner in a SQL*Net V2 client/server or server/server connection has terminated une…

JDBC connections are established with the database server when there is an application connection request coming from the client. The JDBC connection pool is intended to have a farm of open JDBC connections to the database …

WebLogic Server Crashes because of native JDBC driver libraries As type-2 JDBC drivers use native code, problems in these drivers may lead to a crash of the JVM and WebLogic Server. If your server crashes, check informatio…

Troubleshooting JDBC problems by debugging or tracing JDBC JDBC debugging and tracing sometimes is key in order to find out what is going on and analyze the SQL statements that actually are sent to the database. However JDB…

Even a transaction timeout will not kill or timeout any action that is done by the resources that are enlisted in this transaction. The actions will run as long as they take, without interruption. A transaction timeout will set …

Problem Description An application gets a binary core file produced when the WebLogic Server process terminates due to some invalid native core (machine specific code). A server crash, JVM crash, machine crash, or HotSpot…

Problem Description Oracle uses the OPEN_CURSORS parameter to specify the maximum number of open cursors a session can have at once. When this number is exceeded, Oracle reports an ORA-01000 error. When this error is propa…

If the configured amount of allowed open cursors in an Oracle database is exceeded, the following error message will be thrown: java.sql.SQLException: ORA-01000: maximum open cursors exceeded This can be due to the follow…

ResourceException during JDBCDataSource.getConnection() (weblogic.common.ResourceException: No resources available) ResourceExceptionsare thrown when a getConnection()request via a DataSourceto a JDBC connection pool cannot…

The following topics will be covered in this blog. JDBC Datasource/Pooling Issues Weblogic Server obtains JDBC connections from a Datasource. Each configured datasource contains a pool of database connections. Configuring …

Connection Usage             Collect information about threads currently using connections from the pool              Data Collected:             * PoolName - name of the data source to which this connection belongs          …

This document is provided as a guideline for migrating the Weblogic Proxy Plugin configuration from Oracle iPlanet Web Server (iWS), 6.1.x and 7.0.x, to Oracle HTTP Server 11g (OHS).  iPlanet 6.1.x and 7.0.x Configuration …

How To Migrate Oracle iPlanet Web Server Virtual Server Settings To Oracle HTTP Server 11g

The iPlanet logo (Photo credit: Wikipedia ) This document is provided as a guideline for migrating Virtual Server settings from Oracle iPlanet Web Server (iWS) to Oracle HTTP Server 11g (OHS).   iPlanet Web Server 7…

Defining WebLogic Server Terms

Weblogic Terminology Domain:  The basic administrative unit of a Weblogic Server Installation is a Domain. A logically related group of Weblogic server resources that managed as a unit. Server: A server is a instance …

Gone through lots of Weblogic Administration  Interview in this year with companies like Oracle, Cognizant, Tech Mahindra, Vodafone, IBM etc. I'm trying to post here some common weblogic interview questions with Answers. P…

Symptoms When a single JSF page application with a backing bean that contains an apache commons logging statement using Log4j.jar as the logging provider is deployed,Weblogic always throws an exception. Including commons-log…

Symptoms Deploying an ear application onto a WLS 10.3.x domain throws the following error: Web application: "DataExtractWeb2". java.lang.NoClassDefFoundError: org/apache/ log4j /Priority   at org.sagph.dat…

Sometime weblogic throws ClassCastException while application deployment. Below is one of the scenario and steps how go through with this issue. Symptoms WebLogic Server deployment of applications using stax classes is fa…

The JVM crashed. The head of the fatal error log file shows the error message in bold below: # # A fatal error has been detected by the Java Runtime Environment : # # java.lang.OutOfMemoryError: requested 32756 bytes for C…