无法找到或加载主 class java

Question

我有这样的 bat 文件：

java -cp "./lib/*:." TestRunner

当我运行 bat 文件时，我得到了

Can not load main class TestRunner

之前我有这样的命令：

java -cp .\lib\*;. TestRunner

和

java -cp .\lib\*;. com.pkg.TestRunner

同样的错误。

帮我理解一下。我用 maven 编译了所有源代码，所有源代码都存储在目标文件夹 target/src/java/main/com/pkg/TestRunner.class 中，所有未打包在 jar 中的文件刚刚编译，我想运行来自编译文件集的文件

也许 maven 不知何故没有指定 main class,

<?xml version="1.0" encoding="UTF-8"?>
<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.pkg</groupId>
    <artifactId>automation</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>

    <build>
        <directory>target</directory>
        <outputDirectory>target/classes</outputDirectory>
        <finalName>AUTOMATION-01</finalName>
        <testOutputDirectory>target/test-classes</testOutputDirectory>
        <sourceDirectory>src/main/java</sourceDirectory>
        <testSourceDirectory>src/test/java</testSourceDirectory>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
        <testResources>
            <testResource>
                <directory>src/test/resources</directory>
            </testResource>
        </testResources>
    </build>

    <reporting>
        <outputDirectory>target/site</outputDirectory>
    </reporting>

    <profiles>

        <profile>
            <id>release-profile</id>

            <activation>
                <property>
                    <name>performRelease</name>
                </property>
            </activation>

            <build>
                <plugins>

                    <plugin>
                        <inherited>true</inherited>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-source-plugin</artifactId>

                        <executions>
                            <execution>
                                <id>attach-sources</id>
                                <goals>
                                    <goal>jar</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>

                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                        <version>3.3</version>
                        <configuration>
                            <source>1.7</source>
                            <target>1.7</target>
                        </configuration>
                    </plugin>

                    <plugin>
                        <inherited>true</inherited>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-deploy-plugin</artifactId>
                        <configuration>
                            <updateReleaseInfo>true</updateReleaseInfo>
                        </configuration>
                    </plugin>

                </plugins>

            </build>
        </profile>
    </profiles>


    <dependencies>

        <dependency>
            <groupId>javax.xml.ws</groupId>
            <artifactId>jaxws-api</artifactId>
            <version>2.2.11</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.2.11</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jaxb</groupId>
            <artifactId>jaxb-runtime</artifactId>
            <version>2.2.11</version>
        </dependency>

    </dependencies>


</project>

我的树：

\---target
    +---classes
    |   +---com
    |   |   +---example
    |   |   |   \---ru
    |   |   |       \---pkg
    |   |   |           \---webservices
    |   |   |               +---submission
    |   |   |               |   \---submissionapi
    |   |   |               \---synchronisation
    |   |   |                   \---syncsfdataapi
    |   |   +---module
    |   |   |   +---ac
    |   |   |   |   \---ws
    |   |   |   |       \---tt
    |   |   |   |           \---webservice
    |   |   |   |               \---pc
    |   |   |   |                   \---quoting
    |   |   |   |                       \---quotingapi
    |   |   |   \---ws
    |   |   |       \---soapheaders
    |   |   \---pkg
    |   |       +---comparation
    |   |       +---filters
    |   |       +---model
    |   |       +---runner
    |   |       +---utils
    |   |       \---ws
    |   \---data_request
    |       +---request
    |       \---responce
    \---maven-status
        \---maven-compiler-plugin
            \---compile
                \---default-compile

Answer 1

很简单。添加到 maven pom.xml 指令以将有关主要 class 和所需库的信息放入 MANIFEST.MF:

        <plugin>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <mainClass>com.pkg.TestRunner</mainClass>
                        <classpathPrefix>lib/</classpathPrefix>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-dependency-plugin</artifactId>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>${project.build.directory}/lib</outputDirectory>
                    </configuration>
                </execution>
            </executions>
        </plugin>

执行打包后，您可以使用命令启动应用程序

java -jar project.jar

where project - 项目名称。

Answer 2

你试过不使用 :. 因为这看起来像 bash syntax 这意味着如果 .\lib\* 不存在则使用当前目录 .

如果您使用 windows，我建议您删除 :. 并尝试其中一种变体

java -cp "./lib/*" TestRunner 
java -cp ".\lib\*" TestRunner 
java -cp "lib\*" TestRunner

所有这些都使用相对路径。如果失败，您应该尝试使用完整路径：

java -cp "c:/some/folder/lib" TestRunner 
java -cp "c:\some\folder\lib" TestRunner

更新：

试着转置这个抓取的例子here

D:\myprogram\
      |
      ---> org\
            |
            ---> mypackage\
                     |
                     ---> HelloWorld.class
                     ---> SupportClass.class
                     ---> UtilClass.class

.

java -classpath D:\myprogram org.mypackage.HelloWorld

Answer 3

由于 TestRunner 位于 com.pkg.runner 包中，首先尝试运行它：

java -classpath . com.pkg.runner.TestRunner

请注意，当您执行运行 java 命令时，您必须位于 com 文件夹的上一级目录。

在这里写下结果

无法找到或加载主 class java

Can not find or load main class java

java

windows

cmd

classpath

maven