OC4J Installation and Configuration

Download, install and configure the Oracle OC4J 10.1.3.5 stand alone server

Configure

In OC4J 10.1.3 I actually had to comment out this line in [j2ee.home]/config/system-application.xml like so

<!--import-shared-library name="oracle.toplink"-->

to get Hibernate to work correctly.  Something to to with antlr packages conflicting with OC4J's.

Swapping Out The OC4J 10.1.3 XML Parser

In order to use Spring 3.0 with OC4J 10.1.3, you'll need to swap out the default XML parser in OC4J with something more modern.  xercesImpl.jar and xml-apis.jar work fine.  To swap the parser out, you need to create a new shared library in the OC4J enterprise manager and then edit the system-application.xml file to use your new shared library instead of the Oracle XML parser.

1. Open $OC4J_HOME/j2ee/home/application-deployments/default/orion-application.xml in a text editor.  On my system, it did not exist, so I had to create it.
2. If you had to create the file anew, these are the contents of the file:

<?xml version='1.0' encoding='utf-8'?>
<orion-application
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="http://xmlns.oracle.com/oracleas/schema/orion-application-10_0.xsd"
    schema-major-version="10"
    schema-minor-version="0"
    component-classification="internal">
    <imported-shared-libraries>
        <remove-inherited name="oracle.xml"/>
    </imported-shared-libraries>
</orion-application>

If you had an existing file, add this block to it:

<imported-shared-libraries>
    <remove-inherited name="oracle.xml"/>
</imported-shared-libraries>

Once you save these files and restart OC4J, you will be using the new XML parser.

Getting Better Debugging Information  From OC4J

By default, some run time errors that you'll see when testing web apps in OC4J are not too helpful. You can coax OC4J into giving you more information about certain errors by these changes in global-web-application.xml :

1. Turn on "development" mode - in the <orion-web-app> section at the top of the file, change the "development" setting to true:

<orion-web-app
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:noNamespaceSchemaLocation="http://xmlns.oracle.com/oracleas/schema/orion-web-10_0.xsd"
  jsp-cache-directory="./persistence"
  servlet-webdir="/servlet"
  development="true"
  jsp-timeout="0"
  jsp-cache-tlds="standard"
  schema-major-version="10"
  schema-minor-version="0">

2. Turn on debug mode. In the "jsp" servlet section, set a parameter debug_mode to true. The section should look like this:

<servlet>
      <servlet-name>jsp</servlet-name>
      <servlet-class>oracle.jsp.runtimev2.JspServlet</servlet-class>
      <init-param>
        <param-name>debug_mode</param-name>
        <param-value>true</param-value>    
      </init-param>
      <load-on-startup>0</load-on-startup>
</servlet>

With these settings, you should get more meaningful messages in your browser when you run into certain errors (JSP syntax errors for example).

Add a Datasource

We need to add a datasource to our applications can pull data from the database.  Edit [j2ee.home]/config/data-sources.xml to add a datasource.  Here's an example of adding a MITSIS datasource:

<data-source
    class="com.evermind.sql.DriverManagerDataSource"
    name="OracleDS2"
    location="jdbc/MitsisDS"
    xa-location="jdbc/xa/StargateXADS-unused"
    ejb-location="jdbc/OracleDS-unused"
    connection-driver="oracle.jdbc.driver.OracleDriver"
    username=""
    password=""
    url="jdbc:oracle:thin:@//earth-vault-2.mit.edu:1523/sundev2"
    inactivity-timeout="30"
/>

where obviously you'll add your username and password.