If you get a build error similar to this in Java

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If you get a build error similar to this
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BUILD FAILED: file: /workspace/comqualityeclipsefavorites/buildxml:182: Unable to find a javac compiler; comsuntoolsjavacMain is not on the classpath Perhaps JAVA_HOME does not point to the JDK
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then you may not have the JDK toolsjar file on your Ant classpath Open the Ant > Runtime preference page (see Figure 19-8), and verify that the toolsjar file appears under Global Entries If it does not, then select Global Entries, click Add External JARS , navigate to your
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<JDK>\lib\toolsjar file,
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and click Open so that the toolsjar is added to
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your Ant classpath
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Figure 19-8 The Ant > Runtime preferences page showing toolsjar
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By default, the javac task uses the java compiler found on the Ant classpath as specified above If you want to use the Eclipse compiler, then set the buildcompiler property:
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<property name="buildcompiler" value="orgeclipsejdtcoreJDTCompilerAdapter"/>
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TT 19 Building a product
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Single versus multiple binaries
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What if the public API used by your plug-in has not changed and the code compiles against each version of Eclipse successfully Why should you ship a different binary of your product for each version of Eclipse Given this scenario, a single binary might run correctly on different versions of Eclipse, but are you sure There are cases where the same source compiled against two different versions of Eclipse will produce two different binaries, each of which will only execute correctly on one version of Eclipse, not the other For example, if your code had a method yourMethod(),
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Your code: public void yourMethod() { foo(0); } Eclipse 30: public void foo(int value) { some operation } Eclipse 21: public void foo(long value) { some operation }
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then yourMethod() method would compile under Eclipse 30 and Eclipse 21 without any code changes, but would the version compiled under Eclipse
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30 run in Eclipse 21 Things like this make it well worth the up front time and effort of delivering one binary for each version of Eclipse you intend to support rather than spending that same amount of time and more later on debugging problems in the field
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Editing the same source with different ver-
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sions of Eclipse Sometimes different developers using different versions of Eclipse want to work on the same project If the project in question does not involve any Eclipse plug-ins, then there is no problem The problem arises when the project uses the ECLIPSE_HOME classpath variable, which is automatically managed by the Eclipse environment to point to the current Eclipse installation As a result, any project using ECLIPSE_HOME references plug-ins in the current Eclipse installation For example, a developer using Eclipse 30 will have the project compiled against the Eclipse 30 plug-ins, where as someone using the WebSphere Application Developer 51, which is based upon Eclipse 21, will have that same project compiled against Eclipse 21 plug-ins
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Figure 19-9 The PDE Target Platform preference page
One solution is to use the Plug-in Development Environment Target Platform preference page (see Figure 19-9) Using this preference page, you can retarget the ECLIPSE_HOME classpath variable at a different Eclipse installation The problem with this approach is that it does not address the prob-
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lem of different projects compiled against different versions of Eclipse With this solution, you will have all projects compiled against the same Eclipse installation Another solution is never using the ECLIPSE_HOME classpath variable at all Assuming that we wish to support Eclipse 20, 21 and 30, we install all three Eclipse versions into separate directories with names like
c:\eclipse20, c:\eclipse21
and c:\eclipse30 We then set up three class-
path variables named ECLIPSE20_HOME, ECLIPSE21_HOME and ECLIPSE30_HOME, which point to their respective Eclipse installations If we have a project compiled against Eclipse 30, we would use ECLIPSE30_HOME rather than
ECLIPSE_HOME
With this approach, it doesn't matter which version of Eclipse
is being used as the code is always compiled against one specific Eclipse version In addition, this approach lends itself to delivering one binary for each version of Eclipse you support as shown in the next section Given this information, we want to modify the Favorites project to use this second approach Create a new ECLIPSE30_HOME classpath variable and point it at your Eclipse 30 installation using the Java > Classpath Vari-