配置错误。连接到DB时找不到类[org.apache.derby.jdbc.EmbeddedDriver]

Question

我使用命令mvn exec:java从cmd运行我的应用程序。我的Persistence.xml属性是：

<properties>
        <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
        <property name="javax.persistence.jdbc.url" value="jdbc:derby:DB;create=true" />
        <property name="javax.persistence.jdbc.user" value="test" />
        <property name="javax.persistence.jdbc.password" value="test" />

        <!-- EclipseLink should create the database schema automatically -->
        <property name="eclipselink.ddl-generation" value="create-tables" />
        <property name="eclipselink.ddl-generation.output-mode"
            value="database" />
        <property name="connection.autocommit" value="false"/>
    </properties>

我的pom.xml依赖项和构建属性是： -

 <dependencies>
        <dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>eclipselink</artifactId>
    <version>2.5.0</version>
</dependency>
    <dependency>
        <groupId>org.glassfish.jersey.connectors</groupId>
        <artifactId>jersey-grizzly-connector</artifactId>
        <version>2.16</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-grizzly2-http</artifactId>
        <version>2.16</version>
    </dependency>

    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-grizzly2-servlet</artifactId>
        <version>2.16</version>
    </dependency>

    <dependency>
        <groupId>org.glassfish.grizzly</groupId>
        <artifactId>grizzly-framework</artifactId>
        <version>2.3.18</version>
    </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.5.1</version>
                <inherited>true</inherited>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>1.2.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>java</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <mainClass>com.example.Main</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>

如果使用eclipse运行run as java application中的主类，它运行正常，但使用命令mvn exec:java给出配置错误的错误。未找到类[org.apache.derby.jdbc.EmbeddedDriver]。

Answer 1

您在Derby中缺少带pom.xml驱动程序的库。尝试在pom.xml中添加：

<dependency>
    <groupId>org.apache.derby</groupId>
    <artifactId>derbyclient</artifactId>
    <version>10.11.1.1</version>
</dependency>

在eclipse中它运行可能是因为您手动将驱动程序添加到类路径。