JDK Setup in Java

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For Java Web application development, the JRE you select should be a JDK A JDK contains a Java compiler and other development tools These tools are typically found in the JAR named toolsjar A Java compiler is required for JSP development The JDK version should also be compatible with the server runtime you are planning to use For example, Tomcat versions 5 and above require a JDK that is version 14 or higher, IBM WebSphere requires an IBM JDK, BEA WebLogic comes with a high-performance VM called JRockit, and so forth Some server runtimes come with their own JDK You can add a suitable JDK to Eclipse via opening the Preferences dialog, expanding the Java category, and selecting the Installed JREs page Click the Add button to add the new JRE definition to the workbench (see Figure 410) Specify the JRE type, a name, and select the root directory for this JRE installation
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Verifying the Installation
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After you have installed WTP, there are a few things you can check to verify that all is well First, check that the WTP features are present Invoke the Help About Eclipse SDK command from the menu bar and click the Feature Details button You should see features named J2EE Standard Tools and Web Standard Tools listed Of course, this list should also contain the prerequisite EMF, GEF, and JEM features If these features are not present, there is no point in starting development Try reinstalling If the features are present, then you should see user interface contributions from WTP Open the Preferences dialog and verify that the following WTP contributed categories are present: Data, Internet, XDoclet, Server, Validation, Web and XML, and Web Services Expand the Internet category, select the Cache page, and check the item:
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Prompt me for agreement of licenses for whose terms I have already disagreed
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CHAPTER 4 Setting Up Your Workspace
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Figure 410 Adding a JRE
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This will allow WTP to display license terms dialogs for those components to which you might have accidentally disagreed Finally, you can try the Quick Tour (see 3) At this point things are ready to go The following sections describe how you can use settings to tailor the behavior of WTP to your tastes However, before leaving the topic of installation we ll briefly discuss updating WTP to new versions
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Updating WTP
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Updating from an older version of WTP to a newer release is simple with the Update Manager However, the Update Manager only updates Eclipse features and plug-ins You also need to update your configuration settings and development projects
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Configuring WTP
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Workspaces contain both development artifacts such as Java source files, which are completely independent of Eclipse, and setting files, which are specific to Eclipse In general, workspaces are not guaranteed to be fully compatible between major releases For example, new views may be added and old ones deprecated, eventually to be completely removed Such is the price of progress The safest way to move up to a new major release is to check in your projects to a source code repository before you update and then check them back out into new workspaces after you update You can also preserve global workspace settings by exporting them before the update and then importing them back into your new workspace after the update However, creating new workspaces does take time, so WTP supports workspace migration If you open an existing workspace with a new version of WTP, then any downlevel settings will be automatically updated This is a one-time process and may mean that you can no longer use the updated workspace with an older version of WTP Note that you may also have third-party settings that need to be updated
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Tip: You should always make a backup of your workspace before updating Typically, once a workspace is updated, it cannot be used with the older version again Your backup will always give you the ability to revert to the older version if anything goes wrong
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If you do back up your workspace and later have trouble locating it, you can always start Eclipse with the -data option, for example,
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