我正在尝试编译我正在编写的 Java Web 应用程序，但我遇到了我不知道该怎么做的编译错误。从我所做的谷歌搜索中，我发现了这个SO 问题，但是asker 正在使用 EJB，而我的错误出现在 JPA 实体类中。
这是 Maven 构建错误。
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.988s
[INFO] Finished at: Mon Jun 24 02:39:51 UTC 2013
[INFO] Final Memory: 15M/247M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project donebox: Compilation failure: Compilation failure:
[ERROR] /home/cl-server/builder/tomcat-ide-builder/temp/build-1236514164814552082/src/main/java/net/donebox/accounts/User.java:[50,4] error: annotation type not applicable to this kind of declaration
[ERROR] /home/cl-server/builder/tomcat-ide-builder/temp/build-1236514164814552082/src/main/java/net/donebox/accounts/User.java:[60,4] error: annotation type not applicable to this kind of declaration
[ERROR] /home/cl-server/builder/tomcat-ide-builder/temp/build-1236514164814552082/src/main/java/net/donebox/accounts/Role.java:[53,4] error: annotation type not applicable to this kind of declaration
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
这是我的用户类文件。
package net.donebox.accounts;
import java.io.Serializable;
import java.util.UUID;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Basic;
import javax.persistence.Cacheable;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;
import javax.persistence.Table;
import javax.persistence.Column;
import javax.persistence.Index;
import javax.persistence.ManyToMany;
import javax.persistence.JoinTable;
import org.apache.shiro.crypto.hash.Sha256Hash;
import org.apache.shiro.crypto.RandomNumberGenerator;
import org.apache.shiro.crypto.SecureRandomNumberGenerator;
@Entity
@Table(name="users")
public class User {
private UUID id;
private String username;
private String email;
private String password;
private Set<Role> roles = new HashSet<Role>();
@Id
@GeneratedValue
public UUID getId() {
return id;
}
public void setId() {
this.id = UUID.randomUUID();
}
/**
* Returns the username associated with this user account;
*
* @return the username associated with this user account;
*/
@Basic
@Column(length=100)
@Index(name="idx_users_username", columnList="username") //Error here.
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Basic
@Index(name="idx_users_email", columnList="email") // And here.
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
/**
* Returns the password for this user.
*
* @return this user's password
*/
@Basic(optional=false)
@Column(length=255)
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@ManyToMany
@JoinTable(name="users_roles")
public Set<Role> getRoles() {
return roles;
}
public void setRoles(Set<Role> roles) {
this.roles = roles;
}
}
我查看了 javax.persistence.Index JavaDoc，我的声明是正确的，所以我被难住了，有人知道我做错了什么吗？感谢您的时间和考虑。