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SomMeri / less4j

Less language is an extension of css and less4j compiles it into regular css. Less adds several dynamic features into css: variables, expressions, nested rules, and so on. Less was designed to be compatible with css and any correct css file is also correct less file.
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OutOfMemoryError: Java heap space when compiling unwanted source maps #362

Open fnicollet opened 7 years ago

fnicollet commented 7 years ago

Hello,

We are running into an error, here is the stack trace:

Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2367)
    at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:130)
    at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:114)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)
    at java.lang.StringBuilder.append(StringBuilder.java:132)
    at java.lang.StringBuilder.append(StringBuilder.java:179)
    at java.lang.StringBuilder.append(StringBuilder.java:72)
    at com.github.sommeri.sourcemap.SourceMapGeneratorV3.addValuesList(SourceMapGeneratorV3.java:367)
    at com.github.sommeri.sourcemap.SourceMapGeneratorV3.addSourceContentMap(SourceMapGeneratorV3.java:339)
    at com.github.sommeri.sourcemap.SourceMapGeneratorV3.appendTo(SourceMapGeneratorV3.java:314)
    at com.github.sommeri.less4j.core.output.SourceMapBuilder.toSourceMap(SourceMapBuilder.java:135)
    at com.github.sommeri.less4j.utils.CssPrinter.toSourceMap(CssPrinter.java:1052)
    at com.github.sommeri.less4j.core.ThreadUnsafeLessCompiler.createCompilationResult(ThreadUnsafeLessCompiler.java:120)
    at com.github.sommeri.less4j.core.ThreadUnsafeLessCompiler.doCompile(ThreadUnsafeLessCompiler.java:88)
    at com.github.sommeri.less4j.core.ThreadUnsafeLessCompiler.compile(ThreadUnsafeLessCompiler.java:76)
    at com.github.sommeri.less4j.core.ThreadUnsafeLessCompiler.compile(ThreadUnsafeLessCompiler.java:65)
    at com.github.sommeri.less4j.core.DefaultLessCompiler.compile(DefaultLessCompiler.java:44)
    at utils.applications.ThemeCompiler.compileThemeContent(ThemeCompiler.java:186)

We don't really care about source map, we don't actually have any, we are just compiling a lot of tiny less files. I tried disabling the source map altogether:

      LessCompiler.Configuration configuration = new LessCompiler.Configuration();
      configuration.getSourceMapConfiguration().setLinkSourceMap(false);
      LessCompiler.CompilationResult result = lessCompiler.compile(source, configuration);

But when I read the code, the option is read in "handleSourceMapLink": https://github.com/SomMeri/less4j/blob/bca5cb262c018f38ea8c58175df344c7d2345148/src/main/java/com/github/sommeri/less4j/core/ThreadUnsafeLessCompiler.java#L201

Which is right after the "toSourceMap" line where it crashes: https://github.com/SomMeri/less4j/blob/bca5cb262c018f38ea8c58175df344c7d2345148/src/main/java/com/github/sommeri/less4j/core/ThreadUnsafeLessCompiler.java#L177-L179

Is it an error in less4j? Should the option be read earlier so that it doesn't concatenate Strings that won't be used later?

Fabien