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【Maven】在Maven中运行java main函数的方法（3 ways to run Java main from Maven）

2014-09-16 17:43 567 查看
3 ways to run Java main from Maven



1、说明

    本文主要是参考原英文博客中的内容同时结合自己的实例，将在Maven中运行Java main函数的三种方法进行介绍。如有雷同，纯属巧合。

在前面译文博客中（博客链接：http://blog.csdn.net/wolfofsiberian/article/details/39295955），介绍了如何用Maven实现Hello World程序，

但是并没有提到怎么运行此项目。下面就开始介绍如何运行main程序：

2、直接在命令行上运行-Running from Command line

    

    在你还没有在maven phase中运行你的代码的时候，首先你要做的是需要编译代码。需要记住：exec:java 是不会自动编译代码的，

使用前都要自己去先编译。

附加pom.xml文件内容：

<?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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>org.springframework</groupId>
<artifactId>gs-maven</artifactId>
<packaging>jar</packaging>
<version>0.1.0</version>
<!-- Following is add for test "Declare Dependencies" -->
<!-- tag::joda[] -->
<dependencies>
<!--
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>-->
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
<!-- end::joda[] -->
<!-- mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DgroupId=org.springframework -DartifactId=gs-maven-->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>hello.HelloWorld</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>


执行编译命令：

mvn compile

（下面是本例的编译结果）

C:\apache-tomcat-8.0.9\webapps\gs-maven>mvn compile

[INFO] Scanning for projects...

[INFO]

[INFO] ------------------------------------------------------------------------

[INFO] Building gs-maven 0.1.0

[INFO] ------------------------------------------------------------------------

[INFO]

[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gs-maven ---

[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!

[INFO] skip non existing resourceDirectory C:\apache-tomcat-8.0.9\webapps\gs-maven\src\main\resources

[INFO]

[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gs-maven ---

[INFO] Changes detected - recompiling the module!

[WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!

[INFO] Compiling 2 source files to C:\apache-tomcat-8.0.9\webapps\gs-maven\target\classes

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 11.390 s

[INFO] Finished at: 2014-09-16T19:53:32+08:00

[INFO] Final Memory: 9M/23M

[INFO] ------------------------------------------------------------------------

 一旦完成代码的编译，你就可以按照下面的命令来运行你的类了：

不带参数的运行方法：- Without arguments

(这里mainClass需要写到包含main函数的类。例子当中，hello是类的包名，HelloWorld类是main函数所在的类。)

mvn exec:java -Dexec.mainClass="hello.HelloWorld"


运行结果如下：

C:\apache-tomcat-8.0.9\webapps\gs-maven>mvn exec:java -Dexec.mainClass="hello.HelloWorld"
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building gs-maven 0.1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (default-cli) @ gs-maven ---
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.
The current local time is: 19:57:12.140

Hello world!
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.828 s
[INFO] Finished at: 2014-09-16T19:57:12+08:00
[INFO] Final Memory: 7M/18M
[INFO] ------------------------------------------------------------------------

带参数的运行方法：- With arguments

mvn exec:java -Dexec.mainClass="hello.HelloWorld" -Dexec.args="arg0 arg1 arg2"

使用在CLASSPATH中的运行时依赖关系：-  With runtime dependencies in the CLASSPATH

mvn exec:java -Dexec.mainClass="hello.HelloWorld" -Dexec.classpathScope=runtime


3、在pom.xml中的一个phase中运行- Running in a phase in pom.xml

   

     你也可以在一个maven phase中运行main方法。例如，你可以作为test phase的一部分来运行HelloWorld.main()方法。

   需要关注的部分内容：

   

<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1.1</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>hello.HelloWorld</mainClass>
<arguments>
<argument>arg0</argument>
<argument>arg1</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>


    修改后的完整pom.xml文件为：

<?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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>org.springframework</groupId>
<artifactId>gs-maven</artifactId>
<packaging>jar</packaging>
<version>0.1.0</version>
<!-- Following is add for test "Declare Dependencies" -->
<!-- tag::joda[] -->
<dependencies>
<!--
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>-->
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
<!-- end::joda[] -->
<!-- mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DgroupId=org.springframework -DartifactId=gs-maven-->
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1.1</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>hello.HelloWorld</mainClass>
<arguments>
<argument>arg0</argument>
<argument>arg1</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>


按照上面的配置来运行exec插件，简单的按照相应的phase运行：（可以先执行mvn clean清理一下）执行mvn test命令。

mvn test


执行结果如下：
C:\apache-tomcat-8.0.9\webapps\gs-maven>mvn test
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building gs-maven 0.1.0
[INFO] ------------------------------------------------------------------------
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/exec-maven-plugin/1.1.1/exec-maven-plugin-1.1.1.pom Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/exec-maven-plugin/1.1.1/exec-maven-plugin-1.1.1.pom (5 KB at 0.8 KB/sec)
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/mojo-parent/20/mojo-parent-20.pom Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/mojo-parent/20/mojo-parent-20.pom (19 KB at 17.0 KB/sec)
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/mojo/exec-maven-plugin/1.1.1/exec-maven-plugin-1.1.1.jar Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/mojo/exec-maven-plugin/1.1.1/exec-maven-plugin-1.1.1.jar (34 KB at 11.4 KB/sec
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gs-maven ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\apache-tomcat-8.0.9\webapps\gs-maven\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gs-maven ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
[INFO] Compiling 2 source files to C:\apache-tomcat-8.0.9\webapps\gs-maven\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ gs-maven ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\apache-tomcat-8.0.9\webapps\gs-maven\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ gs-maven ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ gs-maven ---
[INFO] No tests to run.
[INFO]
[INFO] >>> exec-maven-plugin:1.1.1:java (default) > validate @ gs-maven >>>
[INFO]
[INFO] <<< exec-maven-plugin:1.1.1:java (default) < validate @ gs-maven <<<
[INFO]
[INFO] --- exec-maven-plugin:1.1.1:java (default) @ gs-maven ---
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/maven-plugin-api/2.0/maven-plugin-api-2.0.pom Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/maven-plugin-api/2.0/maven-plugin-api-2.0.pom (601 B at 1.2 KB/sec)
Downloading: https://repo.maven.apache.org/maven2/org/apache/maven/maven/2.0/maven-2.0.pom Downloaded: https://repo.maven.apache.org/maven2/org/apache/maven/maven/2.0/maven-2.0.pom (9 KB at 9.5 KB/sec)
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.6/plexus-utils-1.5.6.pom Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.6/plexus-utils-1.5.6.pom (6 KB at 6.6 KB/sec)
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus/1.0.12/plexus-1.0.12.pom Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus/1.0.12/plexus-1.0.12.pom (10 KB at 13.0 KB/sec)
Downloading: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.6/plexus-utils-1.5.6.jar Downloaded: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.6/plexus-utils-1.5.6.jar (245 KB at 82.4 KB/sec)
The current local time is: 20:19:55.234

Hello world!
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 29.032 s
[INFO] Finished at: 2014-09-16T20:19:55+08:00
[INFO] Final Memory: 11M/27M
[INFO] ------------------------------------------------------------------------

4、在pom.xml中的profile中运行 - Running in a profile in pom.xml

   

     主要配置内容：

<profiles>
<profile>
<id>code-generator</id>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1.1</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>hello.HelloWorld</mainClass>
<arguments>
<argument>arg0</argument>
<argument>arg1</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>


修改后完整的pom.xml文件：

<?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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>org.springframework</groupId>
<artifactId>gs-maven</artifactId>
<packaging>jar</packaging>
<version>0.1.0</version>
<!-- Following is add for test "Declare Dependencies" -->
<!-- tag::joda[] -->
<dependencies>
<!--
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>-->
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.2</version>
</dependency>
</dependencies>
<!-- end::joda[] -->
<!-- mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DgroupId=org.springframework -DartifactId=gs-maven-->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>hello.HelloWorld</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>code-generator</id>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.1.1</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>hello.HelloWorld</mainClass>
<arguments>
<argument>arg0</argument>
<argument>arg1</argument>
<argument>arg2</argument>
</arguments>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>


调用上面的profile，使用下面的命令来运行：（由于<profiles><profile><id>code-generator</id>...，因此下面-Pcode-generator）

mvn test -Pcode-generator


执行结果：

C:\apache-tomcat-8.0.9\webapps\gs-maven>mvn test -Pcode-generator
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building gs-maven 0.1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gs-maven ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\apache-tomcat-8.0.9\webapps\gs-maven\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ gs-maven ---
[INFO] Changes detected - recompiling the module!
[WARNIN
121f3
G] File encoding has not been set, using platform encoding GBK, i.e. build is platform dependent!
[INFO] Compiling 2 source files to C:\apache-tomcat-8.0.9\webapps\gs-maven\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ gs-maven ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\apache-tomcat-8.0.9\webapps\gs-maven\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ gs-maven ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ gs-maven ---
[INFO] No tests to run.
[INFO]
[INFO] >>> exec-maven-plugin:1.1.1:java (default) > validate @ gs-maven >>>
[INFO]
[INFO] <<< exec-maven-plugin:1.1.1:java (default) < validate @ gs-maven <<<
[INFO]
[INFO] --- exec-maven-plugin:1.1.1:java (default) @ gs-maven ---
The current local time is: 20:36:40.984

Hello world!
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12.937 s
[INFO] Finished at: 2014-09-16T20:36:41+08:00
[INFO] Final Memory: 10M/24M
[INFO] ------------------------------------------------------------------------

以下部分直接来自原始blog内容：

5、Advanced Options

You can get a list of all available parameters by typing:

view plaincopy
to clipboardprint?

mvn exec:help -Ddetail=true -Dgoal=java  

arguments (exec.arguments)
The class arguments.


classpathScope (exec.classpathScope, Default: compile)
Defines the scope of the classpath passed to the plugin. Set to
compile, test, runtime or system depending on your needs


cleanupDaemonThreads (exec.cleanupDaemonThreads)

Wether to interrupt/join and possibly stop the daemon threads upon
quitting.  If this is false, maven does nothing about the daemon threads.
When maven has no more work to do, the VM will normally terminate any
remaining daemon threads.
In certain cases (in particular if maven is embedded), you might need to
keep this enabled to make sure threads are properly cleaned up to ensure
they don't interfere with subsequent activity. In that case, see
daemonThreadJoinTimeout and stopUnresponsiveDaemonThreads for further
tuning.


commandlineArgs (exec.args)

Arguments for the executed program


daemonThreadJoinTimeout (exec.daemonThreadJoinTimeout, Default: 15000)
This defines the number of milliseconds to wait for daemon threads to quit
following their interruption. This is only taken into account if
cleanupDaemonThreads is true. A value <=0 means to not timeout (i.e. wait
indefinitely for threads to finish). Following a timeout, a warning will
be logged. Note: properly coded threads should terminate upon interruption
but some threads may prove problematic: as the VM does interrupt daemon
threads, some code may not have been written to handle interruption
properly. For example java.util.Timer is known to not handle interruptions
in JDK <= 1.6. So it is not possible for us to infinitely wait by default
otherwise maven could hang. A sensible default value has been chosen, but
this default value may change in the future based on user feedback.


executableDependency

If provided the ExecutableDependency identifies which of the plugin
dependencies contains the executable class. This will have the affect of
only including plugin dependencies required by the identified
ExecutableDependency.
If includeProjectDependencies is set to true, all of the project
dependencies will be included on the executable's classpath. Whether a
particular project dependency is a dependency of the identified
ExecutableDependency will be irrelevant to its inclusion in the classpath.


includePluginDependencies (exec.includePluginDependencies, Default: false)
Indicates if this plugin's dependencies should be used when executing the
main class. This is useful when project dependencies are not appropriate. Using
only the plugin dependencies can be particularly useful when the project is not
a java project. For example a mvn project using the csharp plugins only expects
to see dotnet libraries as dependencies.


includeProjectDependencies (exec.includeProjectDependencies, Default: true)
Indicates if the project dependencies should be used when executing the
main class.


mainClass (exec.mainClass)

The main class to execute.


sourceRoot (sourceRoot)

This folder is added to the list of those folders containing source to be
compiled. Use this if your plugin generates source code.


stopUnresponsiveDaemonThreads (exec.stopUnresponsiveDaemonThreads)

Wether to call Thread.stop() following a timing out of waiting for an
interrupted thread to finish. This is only taken into account if
cleanupDaemonThreads is true and the daemonThreadJoinTimeout threshold has
been reached for an uncooperative thread. If this is false, or if
Thread.stop() fails to get the thread to stop, then a warning is logged
and Maven will continue on while the affected threads (and related objects
in memory) linger on. Consider setting this to true if you are invoking
problematic code that you can't fix. An example is Timer which doesn't
respond to interruption. To have Timer fixed, vote for this bug.


systemProperties

A list of system properties to be passed. Note: as the execution is not
forked, some system properties required by the JVM cannot be passed here.
Use MAVEN_OPTS or the exec:exec instead. See the user guide for more
information.


testSourceRoot (testSourceRoot)

This folder is added to the list of those folders containing source to be
compiled for testing. Use this if your plugin generates test source code.

FAQ and Errors


Why do I get this error when specifying arguments to my main method:

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to clipboardprint?

[ERROR] BUILD ERROR  

[INFO] ------------------------------------------------------------------------  

[INFO] Failed to configure plugin parameters for: org.codehaus.mojo:exec-maven-plugin:1.1.1  

on the command line, specify: '-Dexec.arguments=VALUE'  

Cause: Cannot assign configuration entry 'arguments' to 'class [Ljava.lang.String;' from '${exec.arguments}',   

which is of type class java.lang.String  

[INFO] ------------------------------------------------------------------------  

[INFO] Trace  

org.apache.maven.lifecycle.LifecycleExecutionException: Error configuring: org.codehaus.mojo:exec-maven-plugin.   

Reason: Unable to parse the created DOM for plugin configuration  

 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:588)  

 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:513)  

 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:483)  

 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:331)  

 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:292)  

 at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)  

 at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)  

 at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)  

 at org.apache.maven.cli.MavenCli.main(MavenCli.java:301)  

Solution

exec.arguments was used before version 1.1 of the exec plugin, it did not support conversion of command line String to String[] array.
If possible upgrade to 1.1 or later and use exec.args instead of exec.arguments.
If you can't upgrade the plugin version, you can still use command line arguments with a profile and use multiple <argument> tags associated in the pom.xml

References

Official Maven Exec Plugin Documentation

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Original Link：http://www.vineetmanohar.com/2009/11/3-ways-to-run-java-main-from-maven/
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