Java Maven在更改代码时出现问题？

我正在尝试使用NetBeans运行一个小型Maven测试程序。现在，给定的NetBeans代码在Maven上运行得非常好。编译，运行，都很好。但是，当我更改任何内容时，比如添加FXML文件或添加JPA持久性，我就会在启动程序时出错。编译似乎有效，但我无法启动程序。我希望错误出现在Maven的配置中，但我找不到它。代码本身应该可以正常工作

好的，让你们知道我的确切意思，这是代码。我只是向MySQL数据库添加了一个JPA持久性。添加后，程序不再运行

App.java：

Hund.java：

persistence.xml：

---

有人知道问题出在哪里吗？

Maven没有问题。它只是在报告错误。它说它找不到名为“GlassesPU”的持久性提供者

persistence.xml有另一个名称：

<persistence-unit name="com.myproject_MavenProject_jar_1.0-SNAPSHOTPU" ... >

尝试将其更改为“GlassesPU”：

---

如果Maven再次抱怨，可能是因为其他原因。

请告诉我们这些文件在项目层次结构中的位置，特别是持久性。xmlYeah，非常感谢！现在可以了！这确实是持久性单元的错误名称。所以我只是把它改成了GlassesPU，然后很快就不得不将mysql驱动程序添加到pom.xml中，一切都很好！mysql连接器java 5.1.27

package com.myproject.mavenproject;

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Hund implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    private String formerName;
    private String newName;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getFormerName() {
        return formerName;
    }

    public void setFormerName(String formerName) {
        this.formerName = formerName;
    }

    public String getNewName() {
        return newName;
    }

    public void setNewName(String newName) {
        this.newName = newName;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Hund)) {
            return false;
        }
        Hund other = (Hund) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "com.myproject.mavenproject.Hund[ id=" + id + " ]";
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="com.myproject_MavenProject_jar_1.0-SNAPSHOTPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>com.myproject.mavenproject.Hund</class>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/glasses?zeroDateTimeBehavior=convertToNull"/>
      <property name="javax.persistence.jdbc.password" value="mypassword"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.user" value="root"/>
      <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
    </properties>
  </persistence-unit>
</persistence>

<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.myproject</groupId>
  <artifactId>MavenProject</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

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

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

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.persistence</groupId>
      <artifactId>eclipselink</artifactId>
      <version>2.5.1</version>
    </dependency>
    <dependency>
      <groupId>org.eclipse.persistence</groupId>
      <artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
      <version>2.5.1</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>
</project>

cd /home/myuser/NetBeansProjects/MavenProject; JAVA_HOME=/usr/lib/jvm/jdk1.7.0_51 /home/myuser/netbeans-7.4/java/maven/bin/mvn "-Dexec.args=-classpath %classpath com.myproject.mavenproject.App" -Dexec.executable=/usr/lib/jvm/jdk1.7.0_51/bin/java org.codehaus.mojo:exec-maven-plugin:1.2.1:exec
Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
Scanning for projects...

------------------------------------------------------------------------
Building MavenProject 1.0-SNAPSHOT
------------------------------------------------------------------------

--- exec-maven-plugin:1.2.1:exec (default-cli) @ MavenProject ---
Hello new World!
Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named GlassesPU
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at com.myproject.mavenproject.App.main(App.java:18)
------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 0.891s
Finished at: Mon Feb 03 21:35:25 CET 2014
Final Memory: 5M/111M
------------------------------------------------------------------------
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:exec (default-cli) on project MavenProject: Command execution failed. Process exited with an error: 1 (Exit value: 1) -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named GlassesPU

<persistence-unit name="com.myproject_MavenProject_jar_1.0-SNAPSHOTPU" ... >

<persistence-unit name="GlassesPU" ...>