java - GWT 编译器错误：元素 'extend-property' 包含意外的属性 'fallback-value'

Question

当我尝试在服务器上运行我的应用程序时，出现以下错误：

Error:GWT Compiler: Element 'extend-property' beginning on line 27 contains unexpected attribute 'fallback-value'
Error:GWT Compiler: Failure while parsing XML
Error:GWT Compiler: at com.google.gwt.dev.util.xml.DefaultSchema.onUnexpectedAttribute(DefaultSchema.java:68)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.Schema.onUnexpectedAttribute(Schema.java:80)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:224)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:506)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:182)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1303)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2717)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:607)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:489)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:327)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$100(ReflectiveParser.java:48)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:398)
Error:GWT Compiler: at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:257)
Error:GWT Compiler: at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:354)
Error:GWT Compiler: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Error:GWT Compiler: at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
Error:GWT Compiler: at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Error:GWT Compiler: at java.lang.reflect.Method.invoke(Method.java:601)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:223)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:270)
Error:GWT Compiler: at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:766)
Error:GWT Compiler: at com.google.gwt.dev.cfg.ModuleDefLoader$1.load(ModuleDefLoader.java:169)
Error:GWT Compiler: at com.google.gwt.dev.cfg.ModuleDefLoader.doLoadModule(ModuleDefLoader.java:283)
Error:GWT Compiler: at com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(ModuleDefLoader.java:141)
Error:GWT Compiler: at com.google.gwt.dev.Compiler.run(Compiler.java:184)
Error:GWT Compiler: at com.google.gwt.dev.Compiler$1.run(Compiler.java:152)
Error:GWT Compiler: at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:87)
Error:GWT Compiler: at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:81)
Error:GWT Compiler: at com.google.gwt.dev.Compiler.main(Compiler.java:159)
Error:GWT Compiler: Unexpected error while processing XML
Error:GWT Compiler: at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:351)
Error:GWT Compiler: Unexpected exception while processing element 'inherits'
Error:GWT Compiler: at com.google.gwt.dev.util.xml.DefaultSchema.onHandlerException(DefaultSchema.java:56)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.Schema.onHandlerException(Schema.java:66)
Error:GWT Compiler: at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:233)

我猜这些都是maven引起的，所以这里是pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.messagedna.dlp</groupId>
  <artifactId>DLPServer</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>DLPServer</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
      <dependency>
          <groupId>com.google.gwt</groupId>
          <artifactId>gwt-servlet</artifactId>
          <version>2.0.3</version>
      </dependency>
      <dependency>
          <groupId>com.google.gwt</groupId>
          <artifactId>gwt-user</artifactId>
          <version>2.0.3</version>
      </dependency>
      <dependency>
          <groupId>com.extjs</groupId>
          <artifactId>gxt</artifactId>
          <version>2.2.0</version>
      </dependency>
      <dependency>
          <groupId>commons-configuration</groupId>
          <artifactId>commons-configuration</artifactId>
          <version>1.9</version>
      </dependency>
      <dependency>
          <groupId>javax.mail</groupId>
          <artifactId>mail</artifactId>
          <version>1.4.5</version>
      </dependency>
      <dependency>
          <groupId>org.apache.james</groupId>
          <artifactId>apache-mime4j</artifactId>
          <version>0.6.1</version>
      </dependency>
      <dependency>
          <groupId>org.apache.tika</groupId>
          <artifactId>tika-parsers</artifactId>
          <version>1.2</version>
      </dependency>
      <dependency>
          <groupId>net.freeutils.jtnef</groupId>
          <artifactId>tnef</artifactId>
          <version>1.5.0</version>
      </dependency>
      <dependency>
          <groupId>com.messagedna-archive.mimeparser</groupId>
          <artifactId>MimeParser</artifactId>
          <version>1.0</version>
      </dependency>

      <dependency>
          <groupId>com.rabbitmq</groupId>
          <artifactId>amqp-client</artifactId>
          <version>3.0.4</version>
      </dependency>
      <dependency>
          <groupId>commons-lang</groupId>
          <artifactId>commons-lang</artifactId>
          <version>2.3</version>
      </dependency>

      <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.10</version>
          <scope>test</scope>
      </dependency>
  </dependencies>
  <build>
        <outputDirectory>war/WEB-INF/classes</outputDirectory>
        <plugins>
          <plugin>
              <groupId>org.codehaus.mojo</groupId>
              <artifactId>gwt-maven-plugin</artifactId>
              <version>1.2</version>
              <executions>
                  <execution>
                      <goals>
                          <goal>compile</goal>
                          <goal>generateAsync</goal>
                          <goal>test</goal>
                      </goals>
                  </execution>
              </executions>
              <configuration>
                  <runTarget>Main.html</runTarget>
                  <style>OBFUSCATED</style>
                  <extraJvmArgs>-Xmx1024m -Xss1024k</extraJvmArgs>
                  <webappDirectory>war</webappDirectory>
              </configuration>
          </plugin>

          <plugin>
              <groupId>org.apache.maven.plugins</groupId>
              <artifactId>maven-war-plugin</artifactId>
              <version>2.1.1</version>
              <configuration>
                  <webappDirectory>war</webappDirectory>
                  <warSourceExcludes>.gwt-tmp/**</warSourceExcludes>
              </configuration>
          </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
  </build>
</project>

每当我尝试在谷歌中搜索时，我都没有找到解决方案，有些问题部分是这样的，但他们没有任何解决方案。

所以，请看看这个，如果你能提出任何解决这个问题的方法，我将非常感激。

Answer 1

来自 GWT 编译器的错误，它可能与 maven 无关，而是与 GWT XML 配置文件有关，例如 UIBinder 文件。

该消息告诉您，您在不希望出现的地方使用了名为“extend-property”的属性。所以在你的项目中寻找这个属性。如果它实际上在 UIBinder XML 文件中，请记住 XML 元素的属性名称必须与相应 java 类的属性名称相同（因此可能没有连字符）。

Answer 2

问题是它是来自 gwt-sdk 的 gwt-user 和另一个由依赖项添加的 gwt-user