While Upgrading Java 7 to Java8 with GWT 2.7,I am Getting the below Exception.Can any one help me to solve this error
[ERROR] Source level must be one of [auto, 1.6, 1.7].
[ERROR] Google Web Toolkit 2.6.1
[ERROR] Compiler [-logLevel level] [-workDir dir] [-[no]compileReport] [-X[no]checkCasts] [-X[no]classMetadata] [-[no]draftCompile] [-[no]checkAssertions] [-X[no]closureCompiler] [-XfragmentCount numF
ragments] [-XfragmentMerge numFragments] [-gen dir] [-optimize level] [-[no]saveSource] [-style style] [-[no]failOnError] [-X[no]enforceStrictResources] [-[no]validateOnly] [-sourceLevel [auto, 1.6, 1
.7]] [-localWorkers count] [-war dir] [-deploy dir] [-extra dir] [-saveSourceOutput dir] module[s]
[ERROR]
[ERROR] where
[ERROR] -logLevel The level of logging detail: ERROR, WARN, INFO, TRACE, DEBUG, SPAM, or ALL
[ERROR] -workDir The compiler's working directory for internal use (must be writeable; defaults to a system temp dir)
[ERROR] -[no]compileReport Compile a report that tells the "Story of Your Compile". (defaults to OFF)
[ERROR] -X[no]checkCasts EXPERIMENTAL: Insert run-time checking of cast operations. (defaults to ON)
[ERROR] -X[no]classMetadata EXPERIMENTAL: Include metadata for some java.lang.Class methods (e.g. getName()). (defaults to ON)
[ERROR] -[no]draftCompile Compile quickly with minimal optimizations. (defaults to OFF)
[ERROR] -[no]checkAssertions Include assert statements in compiled output. (defaults to OFF)
[ERROR] -X[no]closureCompiler EXPERIMENTAL: Compile output Javascript with the Closure compiler for even further optimizations. (defaults to OFF)
[ERROR] -XfragmentCount EXPERIMENTAL: Limits of number of fragments using a code splitter that merges split points.
[ERROR] -XfragmentMerge DEPRECATED (use -XfragmentCount instead): Enables Fragment merging code splitter.
[ERROR] -gen Debugging: causes normally-transient generated types to be saved in the specified directory
[ERROR] -optimize Sets the optimization level used by the compiler. 0=none 9=maximum.
[ERROR] -[no]saveSource Enables saving source code needed by debuggers. Also see -debugDir. (defaults to OFF)
[ERROR] -style Script output style: OBF[USCATED], PRETTY, or DETAILED (defaults to OBF)
[ERROR] -[no]failOnError Fail compilation if any input file contains an error. (defaults to OFF)
[ERROR] -X[no]enforceStrictResources EXPERIMENTAL: Avoid adding implicit dependencies on "client" and "public" for modules that don't define any dependencies. (defaults to OFF)
[ERROR] -[no]validateOnly Validate all source code, but do not compile. (defaults to OFF)
[ERROR] -sourceLevel Specifies Java source level (defaults to auto:1.7)
[ERROR] -localWorkers The number of local workers to use when compiling permutations
[ERROR] -war The directory into which deployable output files will be written (defaults to 'war')
[ERROR] -deploy The directory into which deployable but not servable output files will be written (defaults to 'WEB-INF/deploy' under the -war directory/jar, and may be the sam
e as the -extra directory/jar)
[ERROR] -extra The directory into which extra files, not intended for deployment, will be written
[ERROR] -saveSourceOutput Overrides where source files useful to debuggers will be written. Default: saved with extras.
[ERROR] and
[ERROR] module[s] Specifies the name(s) of the module(s) to compile
[INFO] ------------------------------------------------------------------------
...
Will GWT 2.6 is compatible with Java 8?
[ERROR] Source level must be one of [auto, 1.6, 1.7]. […] [ERROR] -sourceLevel Specifies Java source level (defaults to auto:1.7)
Set -sourceLevel
to 1.7
(or 1.6
) explicitly.
That can be done using either <sourceLevel>1.7</sourceLevel>
in the configuration for the org.codehaus.mojo:gwt-maven-plugin, or setting the maven.compiler.source
property to 1.7
(this will also configure the maven-compiler-plugin). See http://mojo.codehaus.org/gwt-maven-plugin/compile-mojo.html#sourceLevel for the org.codehaus.mojo:gwt-maven-plugin.
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