I use JDT to compile my java classes. BatchCompiler returns a string but I need an array of problems/errors with their column and row information. compiler.compile(units); prints the error to its printwriter, compiler.resolve(unit) does exactly what I want but it can compile only one java file.
I created a compiler object in this way:
Compiler compiler = new Compiler(env, DefaultErrorHandlingPolicies.exitAfterAllProblems(), new CompilerOptions(), requestor, new DefaultProblemFactory());
And create CompilationUnits that contains filenames and file contents to the compiler.
CompilationUnit[] units = project.toCompilationUnit();
AFAIK, there are 2 ways to compile, one of them is compile(units) method that returns void and prints errors and problems to its PrintWriter, because it doesn't return column information it's not useful for me. The other way is resolve(unit) method but it can work with only one CompilationUnit.
compiler.resolve(units[index], true, true, true);
Does anyone know how I can use JDT compiler programmatically to compile multiple files?
org.eclipse.jdt.internal.compiler.Compiler is internal API. According to the JavaDoc of its resolve method: Internal API used to resolve a given compilation unit. Can run a subset of the compilation process.
Instead, the official way of compiling Java files and determining the compilation problems is described here. Basically, you create a Java project and invoke Eclipse's builder on it, then query the project's Java problem markers.
Related
In my eclipse, when i check for method help with ctrl+space i see the method parameters are showing like strings, int as arguments. Not showing like, string name/int id .
getAttribute(String arg0)
How can i make the eclipse to show the method as getAttribute(String name)
This is really difficult to me identify which param i should pass fro a method.
Any idea, where should i set the settings?
This problem happens when eclipse can't find the source or attached Javadoc, since java argument names are usually not present in the .class files (it would only be present in debug, and not for the interfaces).
You can check if a source or a documentation is attached using the helper F3.
You can increase the timeout eclipse uses for fetching a parameter name from attached Javadoc in the settings.
You can also attach the corresponding documentation jar or source jar as a dependency in order to allow eclipse to look-up the corresponding source.
I am developing an eclipse plugin that runs code violation checker on the difference of two versions of a file. Right now I am using diff.exe to get the difference between the two files. But as diff.exe is an extrenal app, I realized that its better to use eclipse built-in compare tool to get the file difference.
So I used org.eclipse.compare and reached up to this point:
public static List<Patch> compare(String old, String recent) {
try{
IRangeComparator left = new TokenComparator(old); //what exactly to be passed in this constructor, a file path, a literal value or something else?
IRangeComparator right = new TokenComparator(recent);
RangeDifference[] diffs = RangeDifferencer.findDifferences(left, right); // This line is throwing NPE
//..
// Process RangeDifferences into Collection of Patch collection
//..
}catch(Exception e){}
//Returns a collection of file differences.
return null;
}
Now the problem is I am not sure what exactly to be passed in the constructor TokenComparator(String). The document says this constructor Creates a TokenComparator for the given string. But it is not written what exactly to be passed in this constructor, a file path, a literal value or something else? When I'm passing a file path or a string literal I am getting NullPointerException on the next line of finding differences.
java.lang.NullPointerException
at org.eclipse.compare.internal.core.LCS.isCappingDisabled(LCS.java:98)
at org.eclipse.compare.internal.core.LCS.longestCommonSubsequence(LCS.java:55)
at org.eclipse.compare.rangedifferencer.RangeComparatorLCS.longestCommonSubsequence(RangeComparatorLCS.java:186)
at org.eclipse.compare.rangedifferencer.RangeComparatorLCS.findDifferences(RangeComparatorLCS.java:31)
at org.eclipse.compare.rangedifferencer.RangeDifferencer.findDifferences(RangeDifferencer.java:98)
at org.eclipse.compare.rangedifferencer.RangeDifferencer.findDifferences(RangeDifferencer.java:82)
at org.eclipse.compare.rangedifferencer.RangeDifferencer.findDifferences(RangeDifferencer.java:67)
at com.dassault_systemes.eclipseplugin.codemonview.util.CodeMonDiff.compare(CodeMonDiff.java:48)
at com.dassault_systemes.eclipseplugin.codemonview.util.CodeMonDiff.main(CodeMonDiff.java:56)
Someone please tell what is right way to proceed.
If the question is What value the token comparators constructor takes then the answer is it takes the input string to compare. Specified in javadoc here http://help.eclipse.org/indigo/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fapi%2Forg%2Feclipse%2Fcompare%2Fcontentmergeviewer%2FTokenComparator.html
TokenComparator(String text)
Creates a TokenComparator for the given string.
And the null pointer yo are getting is because in function isCappingDisabled it tries to open the compare plugin which seems to be null. You seem to be missing a direct dependency to the plugin "org.eclipse.compare.core"
The org.eclipse.compare plugin was never meant to be used in standalone : many of its functionalities require a running instance of Eclipse. Furthermore, it mixes core and UI code within the same plugin, which will lead to unexpected behavior if you are not very careful about what you use and what dependencies are actually available in your environment.
You mentionned that you were developping an Eclipse plugin. However, the NPE you get indicates that you are not running your code as an Eclipse plugin, but rather as a standard Java program. In an Eclipse environment, ComparePlugin.getDefault() cannot return null : the plugin needs to be started for that call to return anything but null.... and the mere loading of the ComparePlugin class within Eclipse is enough to start it.
The answer will be a choice :
You need your code to run as a standalone Java program out of Eclipse. In such an event, you cannot use org.eclipse.compare and diff.exe is probably your best choice (or you could switch to an implementation of diff that was implemented in Java in order to be independent of the platform).
You do not need your program to work in a standalone environment, only as an Eclipse plugin. In this case, you can keep the code you're using. However, when you run your code, you have to launch it as a new "Eclipse application" instead of "Java Application". You might want to look at a tutorial on how to develop Eclipse plugins for this, This simple tutorial from Lars Vogel shows how to run a new Eclipse Application to test an Hello World plugin. You will need a similar code, with a menu entry to launch your plugin somewhere (right-click on a file then select "check violations" in your case?).
I am working on an Eclipse JDT plugin that requires parsing large numbers of source files,
so I am hoping to use the batch method ASTParser.createASTs(). The parsing executes without errors, but within the CompilationUnit instances it produces, many of the org.eclipse.jdt.internal.compiler.lookup.SourceTypeBinding instances have had their scope field set to null. This setting to null is occurring in the CompilationUnitDeclaration.cleanUp() methods, which are invoked on a worker thread that is unrelated to my plugin's code (i.e., my plugin's classes do not appear on the cleanUp() method call stack).
My parsing code looks like this (all rawSources are within the same project):
ASTParser parser = ASTParser.newParser(AST.JLS3);
parser.setResolveBindings(true);
parser.setStatementsRecovery(true);
parser.setBindingsRecovery(true);
parser.setIgnoreMethodBodies(false);
parser.setProject(project);
parser.createASTs(rawSources.values().toArray(new ICompilationUnit[0]), new String[0], this, deltaAnalyzer.progressMonitor);
Alternatively, I can execute the parsing this way, and no such problems occur:
for (ICompilationUnit source : rawSources.values())
{
parser.setResolveBindings(true);
parser.setStatementsRecovery(true);
parser.setBindingsRecovery(true);
parser.setIgnoreMethodBodies(false);
parser.setProject(project);
parser.setSource(source);
CompilationUnit ast = (CompilationUnit)parser.createAST(deltaAnalyzer.progressMonitor);
parsedSources.add(deltaAnalyzer.createParsedSource(source, ast));
}
This issue occurs in both Helios and Indigo (the very latest release build). I filed a bug in Eclipse Bugzilla, but if anyone knows of a way to work around this--or if I am using the API wrong--I would greatly appreciate your help.
Byron
Without knowing exactly what your exception is, I can still offer 2 suggestions:
Have a look at org.eclipse.jdt.ui.SharedASTProvider. If you are not making any changes to ASTs, this class may provide a more robust way of getting the ASTs.
Play around with some of the settings that you are using. Do you really need bindingsRecovery set to true? What about statementRecovery? Setting these to false may help you.
I'm trying to work through groovy's Implementing Local AST Transformations tutorial, but whenever I clean my project I get this error in each file that has the #WithLogging annotation in it:
Groovy:Could not find class for Transformation Processor AC.LoggingASTTransformation declared by AC.WithLogging
So you have a package named "AC" that contains both "WithLogging.groovy" and "LoggingASTTransformation.groovy" classes? Does it also contain any classes that implement the "WithLogging" interface?
If so, I'd suggest you move the class(es) that use your annotation to a location outside of the annotation defining package (the default will suffice, for diagnostic purposes) - Order of compilation matters with transformations. See this post on the groovy users mailing list for more on that.
Also try changing the annotation from #WithLogging to #AC.WithLogging.
As far as cleaning with Eclipse is concerned, I had a similar issue and found that I had to make a trivial modification after a clean to any file that contained my annotation. IE, add a space somewhere. Then save the file. This should rebuild everything properly.
GWT compiles the Java source into Javascript, and names the files according to a hash of their contents. I'm getting a new set of files every compile, because the javascript contents are changing, even when I don't change the source at all.
The files are different for OBF and PRETTY output, but if I set it to DETAILED, they're no longer different every compile. In PRETTY, I can see that all/most of the differences between compiles are in the value parameters for typeId. For example, a funciton called initValues() is called with different values for it's typeId parameter.
In PRETTY mode, the differences you see are allocation of Java Classes to TypeIds. It's how GWT manages run time type checking. You'll notice a table at the bottom of each script essentially mapping each typeId to all compatible superclasses. This is how GWT can still throw ClassCastException in JavaScript (though you should run into this very rarely!).
In OBF mode, the differences are due to the allocation of minified function names.
In both cases, it's due to the order the compiler is processing the code. Some internal symbol tables might be using a non-ordered collection store symbols for processing. It can happen for lots of reasons.
As far as I know, GWT will compile a new version every time you compile it, this is a feature ;)
You can use ant to control it though, so that it only builds the GWT section of your application if it's actually changed:
http://wiki.shiftyjelly.com/index.php/GWT#Use_The_Power_of_Ant_to_Build_Changes_Only