我创建了一个新的POJO类，它使用javax.xml.bind.annotation.*将其架构生成为XSD文件。
这是班级：
package <<my_package>>;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import <<MyOtherClass>>;
@XmlRootElement(name = "MyPojo", namespace="<<my_namespace>>")
@XmlAccessorType(XmlAccessType.FIELD)
public class MyPojo {
@XmlElement(name = "MyOtherClass")
private MyOtherClass myOtherClass;
@XmlElement(name = "Message", required = true)
private String message;
public MyOtherClass getMyOtherClass() {
return myOtherClass;
}
public void setMyOtherClass(MyOtherClass myOtherClass) {
this.myOtherClass = myOtherClass;
}
public String getMessage() {
return message;
}
public void setMessage(String essage) {
this.message = message;
}
}
但是，当尝试使用maven编译它时，我收到以下错误：
java.lang.ClassCastException: com.sun.tools.apt.mirror.type.ClassTypeImpl cannot be cast to com.sun.mirror.type.AnnotationType
at com.sun.tools.apt.mirror.declaration.AnnotationMirrorImpl.getAnnotationType(AnnotationMirrorImpl.java:100)
at com.sun.tools.jxc.apt.InlineAnnotationReaderImpl.getAllAnnotations(InlineAnnotationReaderImpl.java:113)
at com.sun.tools.jxc.apt.InlineAnnotationReaderImpl.getAllMethodAnnotations(InlineAnnotationReaderImpl.java:102)
at com.sun.tools.jxc.apt.InlineAnnotationReaderImpl.getAllMethodAnnotations(InlineAnnotationReaderImpl.java:64)
at com.sun.xml.bind.v2.model.impl.ClassInfoImpl.ensureNoAnnotation(ClassInfoImpl.java:1126)
at com.sun.xml.bind.v2.model.impl.ClassInfoImpl.collectGetterSetters(ClassInfoImpl.java:1039)
at com.sun.xml.bind.v2.model.impl.ClassInfoImpl.findGetterSetterProperties(ClassInfoImpl.java:939)
at com.sun.xml.bind.v2.model.impl.ClassInfoImpl.getProperties(ClassInfoImpl.java:310)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:243)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:209)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:315)
at com.sun.xml.bind.v2.model.impl.TypeRefImpl.calcRef(TypeRefImpl.java:92)
at com.sun.xml.bind.v2.model.impl.TypeRefImpl.getTarget(TypeRefImpl.java:69)
at com.sun.xml.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:74)
at com.sun.xml.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:77)
at java.util.AbstractList$Itr.next(AbstractList.java:358)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:255)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:209)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:315)
at com.sun.xml.bind.v2.model.impl.TypeRefImpl.calcRef(TypeRefImpl.java:92)
at com.sun.xml.bind.v2.model.impl.TypeRefImpl.getTarget(TypeRefImpl.java:69)
at com.sun.xml.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:74)
at com.sun.xml.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:77)
at java.util.AbstractList$Itr.next(AbstractList.java:358)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:255)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:209)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:315)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:330)
at com.sun.tools.xjc.api.impl.j2s.JavaCompilerImpl.bind(JavaCompilerImpl.java:90)
at com.sun.tools.jxc.apt.SchemaGenerator$1.process(SchemaGenerator.java:115)
at com.sun.mirror.apt.AnnotationProcessors$CompositeAnnotationProcessor.process(AnnotationProcessors.java:84)
at com.sun.tools.apt.comp.Apt.main(Apt.java:480)
at com.sun.tools.apt.main.AptJavaCompiler.compile(AptJavaCompiler.java:270)
at com.sun.tools.apt.main.Main.compile(Main.java:1127)
at com.sun.tools.apt.main.Main.compile(Main.java:989)
at com.sun.tools.apt.Main.processing(Main.java:113)
at com.sun.tools.apt.Main.process(Main.java:103)
at com.sun.tools.apt.Main.process(Main.java:85)
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.sun.tools.jxc.AptBasedTask$InternalAptAdapter.execute(AptBasedTask.java:97)
at com.sun.tools.jxc.AptBasedTask.compile(AptBasedTask.java:144)
at com.sun.tools.jxc.maven2.SchemaGenAdapter.execute(SchemaGenAdapter.java:111)
at com.sun.tools.jxc.maven2.SchemaGenMojo.execute(SchemaGenMojo.java:161)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
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.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
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.execution.application.AppMain.main(AppMain.java:144)
为什么我会收到此错误以及如何解决？
答案 0 :(得分：1)
过了一会儿，我想出来了。在我的POJO课程中，我引用了MyOtherClass，其中包含以下代码：
package <<my_package>>;
import java.math.BigDecimal;
public class MyOtherClass {
private int id;
private BigDecimal quantity;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public BigDecimal getQuantity() {
return quantity;
}
public void setQuantity(BigDecimal quantity) {
this.quantity = quantity;
}
}
此文件没有XML注释，因此Java不知道如何在XSD中生成其架构。然而这是必需的，因为我的POJO需要在XSD中引用它。
修复程序添加了为所有引用对象生成XSD架构所需的所有相关XML注释。在我的情况下，MyOtherClass成为了这个：
package <<my_package>>;
import javax.xml.bind.annotation.*;
import java.math.BigDecimal;
@XmlType(name = "MyOtherClass", namespace = "<<my_namespace>>")
@XmlAccessorType(XmlAccessType.FIELD)
public class MyOtherClass {
@XmlAttribute(name = "id")
private int id;
@XmlAttribute(name = "quantity")
@XmlSchemaType(name = "decimal")
private BigDecimal quantity;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public BigDecimal getQuantity() {
return quantity;
}
public void setQuantity(BigDecimal quantity) {
this.quantity = quantity;
}
}