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Compiling GWT 2.6.1 at the source level of Java 7

I recently upgraded my GWT project to version 2.6.1 and started using Java 7 syntax since 2.6 now supports Java 7.

However, when I try to compile, I get compiler errors such as

[ERROR] Line 42: '<>' operator is not allowed for source level below 1.7

Full exit

Compiling module com.Project
   Validating units:
      Ignored 85 units with compilation errors in first pass.
Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.
   Computing all possible rebind results for 'com.google.gwt.useragent.client.UserAgentAsserter'
      Rebinding com.google.gwt.useragent.client.UserAgentAsserter
         Checking rule <generate-with class='com.google.gwt.editor.rebind.SimpleBeanEditorDriverGenerator'/>
            [WARN] Detected warnings related to 'com.google.gwt.editor.client.SimpleBeanEditorDriver'.   Are validation-api-<version>.jar and validation-api-<version>-sources.jar on the classpath?
            Specify -logLevel DEBUG to see all errors.
            [WARN] Unknown type 'com.google.gwt.editor.client.SimpleBeanEditorDriver' specified in deferred binding rule
   [ERROR] Errors in 'file:/C:/workspace/Project/src/com/project/ProjectFile.java'
      [ERROR] Line 42: '<>' operator is not allowed for source level below 1.7
   [ERROR] Errors in 'file:/C:/workspace/Project/src/com/project/AnotherProjectFile.java'
      [ERROR] Line 188: Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum variables are permitted
C:\workspace\Project\build.xml:51: Java returned: 1
    at org.apache.tools.ant.taskdefs.Java.execute(Java.java:111)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:390)
    at org.apache.tools.ant.Target.performTasks(Target.java:411)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
    at org.apache.tools.ant.Main.runBuild(Main.java:809)
    at org.apache.tools.ant.Main.startAnt(Main.java:217)
    at org.apache.tools.ant.Main.start(Main.java:180)
    at org.apache.tools.ant.Main.main(Main.java:268)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30)
C:\workspace\Project\build.xml:51: Java returned: 1
    at org.apache.tools.ant.taskdefs.Java.execute(Java.java:111)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:390)
    at org.apache.tools.ant.Target.performTasks(Target.java:411)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
    at org.apache.tools.ant.Main.runBuild(Main.java:809)
    at org.apache.tools.ant.Main.startAnt(Main.java:217)
    at org.apache.tools.ant.Main.start(Main.java:180)
    at org.apache.tools.ant.Main.main(Main.java:268)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30)
C:\workspace\Project\build.xml:51: Java returned: 1
    at org.apache.tools.ant.taskdefs.Java.execute(Java.java:111)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:390)
    at org.apache.tools.ant.Target.performTasks(Target.java:411)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
    at org.apache.tools.ant.Main.runBuild(Main.java:809)
    at org.apache.tools.ant.Main.startAnt(Main.java:217)
    at org.apache.tools.ant.Main.start(Main.java:180)
    at org.apache.tools.ant.Main.main(Main.java:268)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.ant.execution.AntMain2.main(AntMain2.java:30)

How do I specify a GWT compiler for targeting 1.7? I got the impression that this will be done by default, but I think not. I tried to clean up the project, including deleting the gwt-unitCache directory, but to no avail.

Here is my Ant compilation.

<target name="compile" depends="prepare">
    <javac includeantruntime="false"
           debug="on"
           debuglevel="lines,vars,source"
           srcdir="${src.dir}"
           destdir="${build.dir}"
           source="7"
           target="7">
        <classpath refid="project.classpath"/>
    </javac>
</target>

<target name="gwt-compile" depends="compile">
    <java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler">
        <classpath>
            <!-- src dir is added to ensure the module.xml file(s) are on the classpath -->
            <pathelement location="${src.dir}"/>
            <pathelement location="${build.dir}"/>
            <path refid="project.classpath"/>
        </classpath>
        <jvmarg value="-Xmx256M"/>
        <arg value="-sourceLevel"/><arg value="7"/>
        <arg value="${gwt.module.name}"/>
    </java>
</target>
+4
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3 answers

The solution ultimately turned out to be a combination of the answers from zpon and Thomas Broyer.

First, delete the directory gwt-unitCache.

javac Ant

<javac includeantruntime="false"
               debug="on"
               debuglevel="lines,vars,source"
               srcdir="${src.dir}"
               destdir="${build.dir}"
               source="7"
               target="7">
   <classpath refid="project.classpath"/>
</javac>

GWT

<java failonerror="true" fork="true" classname="com.google.gwt.dev.Compiler">
    <classpath>
        <pathelement location="${src.dir}"/>
        <pathelement location="${build.dir}"/>
        <path refid="project.classpath"/>
    </classpath>
    <jvmarg value="-Xmx256M"/>
    <arg value="-sourceLevel"/><arg value="7"/>
    <arg value="${gwt.module.name}"/>
</java>
+2

GWT ( SuperDevMode CodeServer) -sourceLevel, , -source javac.

-sourceLevel JVM, Java 7, JDK 1.7.

-sourceLevel 7 ( 1.7) GWT, a -source 7 ( 1.7) javac ( source="7" <javac> Ant)

+4

, , , gwt java (1.6). gwt-unitCache, - gwt , 1.6 ( , ), java 1.7. gwt-unitCache.

, , , , , . , , OP gwt, java, gwt.

+3
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Source: https://habr.com/ru/post/1542665/

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