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Verify that Tomcat is installed correctly before proceeding Tomcat includes commands for starting and stopping the server Do the following: 1 The startup command requires that the environment variable JAVA_HOME be set to the installation directory of the JDK If the JDK installation process did not set JAVA_HOME correctly, set it now to the directory where you installed the JDK (see the Getting a JDK sidebar) 2 To start Tomcat, open a command window and change the current directory to the bin subdirectory of the Tomcat installation directory Then invoke this command:
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startup
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A second command window opens and launches Tomcat on port 8080 by default 3 After the startup process completes, verify that Tomcat is running by opening this URL in a Web browser:
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http://localhost:8080/
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You should see the Tomcat home page displaying this message:
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If you re seeing this page via a web browser, it means you ve setup Tomcat successfully Congratulations!
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4 To stop Tomcat, enter this command in the first command window:
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shutdown
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Tomcat should stop and the second command window should close
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Ports Already in Use Be sure to stop the server Otherwise, when WTP tries to start it you will receive an error message telling you that several ports may already be in use (see Figure 31) If you want to keep Tomcat running outside of WTP, you ll have to use a different set of port numbers in WTP
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Figure 31 Starting Server Error
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Do the following to extend Eclipse with the Tomcat server runtime environment: 1 Launch Eclipse and invoke the command Window Preferences from the menu bar to open the Preferences dialog Expand the Server preferences category and select the Installed Runtimes page (see Figure 32) Note that initially there are no server runtime environment definitions
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CHAPTER 3 Quick Tour
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Installed Server Runtime Environments
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2 Click the Add button to open the New Server Runtime wizard Expand the Apache category and select Apache Tomcat v50 (see Figure 33)
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Figure 33 New Server Runtime
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3 Click the Next button to display the Tomcat Server page Click the Browse button to select the directory where you installed Tomcat (see the Getting Tomcat sidebar), for example,
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E:\jakarta-tomcat-5028
The Tomcat installation directory field should now show the selected directory (see Figure 34)
Figure 34 Tomcat Server
4 The JRE field is initialized to the Workbench default JRE, which is the JVM you used to launch Eclipse
JDK Required for JSP Development Part of the server runtime environment setup process involves specifying the JRE to use for launching Tomcat Be sure to specify a full JDK instead of just a JRE because you ll be doing JSP development If you do not currently have a JDK defined to Eclipse, add the one you previously installed (see the Getting a JDK sidebar) JSP development requires a Java compiler, which is included in the JDK but not the JRE JSP compilation will fail if you specify a JRE Note that you can precompile your JSPs in order to use a JRE in your production server environment
CHAPTER 3 Quick Tour
Click the Installed JREs button to open the Installed JREs wizard This wizard lets you define additional JREs to Eclipse Click the Add button and select the directory where you installed the JDK (see the Getting a JDK sidebar), for example,
E:\ibm-java2-142
The JDK is added to the Installed JREs page Select its checkbox to make it the default JRE (see Figure 35), and click the OK button to return to the Tomcat Server page
Figure 35 Installed JREs
5 Select the JDK from the drop-down list of the JRE field (see Figure 34) When WTP launches Tomcat later, it will use the specified JDK Click the Finish button to complete the definition Tomcat is now listed on the Installed Server Runtime Environments page (see Figure 36) You have now extended Eclipse with a J2EE servlet container and are ready to create your first Java Web application development project