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    <p>From the menu bar: Project -> Properties -> Java Compiler</p> <p>Enable project specific settings (checked) Uncheck "use Compliance from execution environment '.... Select the desired "compiler compliance level"</p> <p>That will allow you to compile "1.5" code using a "1.6" JDK.</p> <p>If you want to acutally use a 1.5 JDK to produce "1.5" compliant code, then install a suitable 1.5 JDK and tell eclipse where it is installed via:</p> <p>Window -> preferences -> Installed JREs </p> <p>And then go back to your project</p> <p>Project -> properties -> Java Build Path -> libraries</p> <p>remove the 1.6 system libaries, and: add library... -> JRE System LIbrary -> Alternate JRE -> The JRE you want.</p> <p>Verify that the correct JRE is on the project's build path, save everything, and enjoy!</p>
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    1. POhow do I get eclipse to use a different compiler version for Java?
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    1. USEdwin Buck
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      1. VTUpMod
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    1. COI had already done all that, except for unchecking 'Use default compliance settings' for the project Java compiler. I unchecked it, cleaned and rebuilt my project, and still had the Java 1.6 errors. I'm using Eclipse 3.3 in case that matters. I noticed that the 'Use default compliance settings' setting for the project didn't save, even after I hit 'Apply' and OK. I even deleted the java 1.6 location that JAVA_HOME was pointing to. So now I really don't know where its getting the Java 1.6 compiler from.
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    2. COIt's not clear if you're setting JAVA_HOME before you run Eclipse, or if you are setting JAVA_HOME in some sort of dialog box within the Eclipse application. If before you run Eclipse, you're changing the JVM that Eclipse is running inside of; best to undo your changes, as you are solving the wrong problem. If you're setting it within an Eclipse dialog, the pseudo slave environment Eclipse launches doesn't override the Eclipse configured JVM you specify to launch. Can you see the desired JDK in Windows -> Preferences -> Installed JREs? What about in "Execution Environments"?
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    3. COWhen I mention JAVA_HOME, I'm referring to the system variable setting (from My Computer properties) that exists before starting Eclipse. I'm not changing JAVA_HOME from inside Eclipse anywhere. Yes I can see the JDK 5 that I want in both Windows->Preferences->Installed JREs and Execution Environments. I'm not sure where all the JREs in Execution Environments are coming from. There is a JavaSE-1.6 there that indicates 'perfect match' for the Java 5 JRE.
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