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With this task in the target, the output will look something like
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Buildfile: build.xml compile: BUILD FAILED C:\AntBook\gettingstarted\build.xml:4: Could not create task of type: javaac.
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Target executed
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File and line where the build failed
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Ant could not find the task or a class this task relies upon. This is common and has a number of causes; the usual solutions are to read the manual pages then download and install needed JAR files, or fix the build file: - You have misspelt javaac . The problem: Fix: check your spelling. javac was - The task needs an external JAR file to execute misspelled and this is not found at the right place in the classpath. Fix: check the documentation for dependencies. Fix: declare the task. - The task is an Ant optional task and optional.jar is absent Fix: look for optional.jar in ANT_HOME/lib, download if needed - The task was not built into optional.jar as dependent libraries were not found at build time. Fix: look in the JAR to verify, then rebuild with the needed libraries, or download a release version from apache.org
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STEP THREE: RUNNING YOUR FIRST BUILD
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- The build file was written for a later version of Ant Fix: upgrade to at least the latest release version of Ant - The task is not an Ant core or optional task and needs to be declared using <taskdef>. Remember that for JAR files to be visible to ant tasks implemented in ANT_HOME/lib, the files must be in the same directory or on the classpath Please do not file bug reports on this problem, nor email the ant mailing lists, until all of these causes have been explored, as this is not an Ant bug.
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Whenever Ant fails to build, the BUILD FAILED message appears a message that will hopefully not be too familiar. Usually it is associated with Java source errors or unit test failures, but build file syntax problems result in the same failure message, accompanied by some informative text. If you do get an error, don t worry. Nothing drastic will happen, files won t be deleted (not in this example, anyway!) and you can try to correct the error by looking at the line of XML named, as well as the lines on either side of the error. If your editor has good XML support, the editor itself will point out any XML language errors, leaving the command line to find only Ant-specific errors. Editors that are Ant-aware or validate against an Ant DTD will also catch many Ant-specific syntax errors. An XML editor would also catch the omission of an ending tag from an XML element, such as forgetting to terminate the target element:
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< xml version="1.0" > <project name="firstbuild" default="compile" > <target name="compile"> <javac srcdir="." /> <echo>compilation complete!</echo> </project>
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The error here would come from the XML parser:
C:\AntBook\gettingstarted\xml-error.xml:6: Expected "</target>" to terminate element starting on line 3.
Well laid out build files, formatted for readability, help to make such errors visible. One error we still encounter regularly comes from having an attribute that isn t valid for that task. Spelling the srcdir attribute as sourcedir is an example of this:
<javac sourcedir="." />
If the build file contains that line, you would see this error message:
compile: BUILD FAILED C:\AntBook\gettingstarted\build.xml:4: The <javac> task doesn t support the "sourcedir" attribute.
GETTING STARTED WITH ANT
This message indicates that the task description contained an invalid attribute. Usually this means whoever created the build file typed something wrong, but could mean that the file s author wrote it for a later version of Ant, one with newer attributes or tasks than the version doing the build. That can be hard to fix without upgrading; sometimes a workaround isn t always possible. It is rare that an upgrade would be incompatible or detrimental to your existing build file; such an upgrade is not anything to fear, since the Ant 1.x product line maintains strict backwards compatibility. The error you are likely to see often in Ant is not caused by an error in the build file; rather, it is the build halting after the compiler failed to compile your code. If, for example, someone forgot the semicolon after the println call, a compiler error message would appear, followed by build failure information:
Buildfile: build.xml compile: [javac] Compiling 1 source file [javac] /home/ant/Projects/firstbuild/Main.java:5: ';' expected [javac] System.out.println("hello, world") [javac] ^ [javac] 1 error BUILD FAILED /home/ant/Projects/firstbuild/build.xml:4: Compile failed, messages should have been provided. Total time: 4 seconds
The build failed on the same line as the previous example error, line four, but this time it did the correct action. The compiler found something wrong, printed out its messages, and notified Ant of the error, which promptly stopped the build. When you get compiler error messages, the line of the XML file is usually unimportant. The name of the Java file and the location within it, along with the compiler error, are the messages that matter. The key point to note is that failure of a task will usually result in the build itself failing. This is essential for a successful build process: there is no point packaging or delivering a project if it did not compile. Ant enforces the rule that failure of a single task halts the entire build.2 2.4.2 Looking at the build in more detail If the build does actually succeed, then the only evidence of this is the message that compilation was successful. Let s run the task again, this time in verbose mode, to see what happens. Ant produces a verbose log when invoked with the -verbose parameter. This is a very useful feature when figuring out what a build file does. For our simple build file, it doubles the amount of text printed:
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