6. One of the most important command-line options (Ftp web hosting)
6. One of the most important command-line options deals with the selection of the Java Virtual Machine (JVM) under which the Eclipse platform is executed. If you don t want to use the standard JVM (the one executed when invoking the java command), you can specify a different JVM by using the command-line option -vm. When the Eclipse loader is invoked it uses a three-stage strategy to determine the JVM under which the platform is executed. If a JVM is explicitly specified with the command-line option -vm, then this VM is used. Otherwise, the loader will look for a specific Java Runtime Environment (JRE) that was deployed with the Eclipse platform. Such a JRE must be located in the directory eclipsejre. If such a JRE does not exist (as in our case), then the location of the VM is derived from the PATH environment variable. By the way, this strategy affects only the JVM under which the platform is executed. Which JVM and which SDK are used for Java development is specified separately in the Eclipse workbench. The command-line option -vmargs can be used to specify parameters for the Java Virtual Machine. For example: eclipse.exe -vm C:java13binjavaw -vmargs -Xmx256M Here Eclipse is started with a specific JVM and sets the JVM heap to 256 MB. With very large projects this can help to prevent instabilities of the workbench. Another important command-line parameter is the parameter-data for specifying the location of the workspace. In this case, the Workspace Launcher dialog discussed previously is skipped. This parameter allows you to create different Eclipse desktop shortcuts for different workspaces. The First Application: Hello World Until now you haven t seen much of a Java development environment. Eclipse which is advertised as a platform for everything and nothing in particular shows, in fact, nothing in particular when invoked for the first time. You are now going to change this radically. Perspectives To see something particular in Eclipse, you first must open an Eclipse perspective. Perspectives consist of a combination of windows and tools best suited for specific tasks. Perspectives are added to the Eclipse workbench by various Eclipse plug-ins. This is, for example, the case with the user interface of the Java IDE, which is nothing more than a large plug-in for the Eclipse workbench. To start developing Java programs, you therefore must first open the Java perspective. To do so, click the Open Perspective icon, as shown in Figure 1.4. 5 Introduction to Eclipse
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