java - Ant 的代码未在 Maven 中运行

Question

这可能是我在 Java 中见过的最奇怪的事情:以下代码(不使用外部库)使用 Ant(在 Netbeans 和 Windows-7 机器上)完美运行:

public static void main( String[] args ) throws IOException, InterruptedException
{
  String prog = "\"C:\\Program Files\\R\\R-2.14.2\\bin\\Rscript.exe\"";
  String[] progParams = new String[]{"C:\\Users\\pantelis\\Desktop\\SB\\MC_Sarfraz_ver5.R"};
  Process p = Runtime.getRuntime().exec(prog+" "+progParams[0]);
  p.waitFor();
  System.out.println(p.exitValue()==0);
  System.out.println("Done!!!"); 
}

它返回输出消息:

true
Done!!!

表示顺利完成。当我尝试使用 Maven 运行完全相同的代码时，我没有发现任何异常，但代码以以下结尾:

false
Done!

并且该过程永远不会执行。这是我的 POM 文件:

<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.mycompany</groupId>
  <artifactId>MVNTest</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>
  <name>MVNTest</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>
  </dependencies>
</project>

更新 1:我使用以下代码打印该过程生成的任何错误消息:

String line;
BufferedReader input = new BufferedReader(new InputStreamReader(p.getErrorStream()));
while ((line = input.readLine()) != null) {
  System.out.println(line);
}

这是输出:

Error in library(RDCOMClient) : there is no package called 'RDCOMClient'
Execution halted

此错误消息仅在我使用 Maven 运行时出现。

更新 2: 当我使用 Maven 运行时，我使用 JDK7。这是相应的命令:

cd C:\Users\pantelis\Documents\NetBeansProjects\MVNTest; 
"JAVA_HOME=C:\\Program Files\\Java\\jdk1.7.0_04" 
"\"C:\\Program Files\\NetBeans 7.1.2\\java\\maven\\bin\\mvn.bat\""  
"-Dexec.args=-classpath %classpath com.mycompany.mvntest.App"
"-Dexec.executable=C:\\Program Files\\Java\\jdk1.7.0_04\\bin\\java.exe" 
-Dexec.classpathScope=runtime process-classes 
org.codehaus.mojo:exec-maven-plugin:1.2:exec

更新 3: 这些是我在使用 Ant 运行时获得的环境变量:

USERPROFILE -> C:\Users\pantelis
ProgramData -> C:\ProgramData
PATHEXT -> .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
Classpath -> C:\LINGO9\Lingo9_0.jar
ProgramFiles(x86) -> C:\Program Files (x86)
TEMP -> C:\Users\pantelis\AppData\Local\Temp
SystemDrive -> C:
ProgramFiles -> C:\Program Files
Path -> C:\Program Files (x86)\MiKTeX 2.9\miktex\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\WIDCOMM\Bluetooth Software\syswow64;\;C:\Program Files (x86)\Sony\VAIO Startup Setting Tool;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\LINGO9\;C:\Program Files (x86)\OpenVPN\bin
HOMEDRIVE -> C:
PROCESSOR_REVISION -> 2505
USERDOMAIN -> pantelis-VAIO
ALLUSERSPROFILE -> C:\ProgramData
ProgramW6432 -> C:\Program Files
PROCESSOR_IDENTIFIER -> Intel64 Family 6 Model 37 Stepping 5, GenuineIntel
SESSIONNAME -> Console
TMP -> C:\Users\pantelis\AppData\Local\Temp
CommonProgramFiles -> C:\Program Files\Common Files
=:: -> ::\
LOGONSERVER -> \\PANTELIS-VAIO
PROCESSOR_ARCHITECTURE -> AMD64
FP_NO_HOST_CHECK -> NO
OS -> Windows_NT
HOMEPATH -> \Users\pantelis
PROCESSOR_LEVEL -> 6
CommonProgramW6432 -> C:\Program Files\Common Files
configsetroot -> C:\Windows\ConfigSetRoot
LOCALAPPDATA -> C:\Users\pantelis\AppData\Local
COMPUTERNAME -> PANTELIS-VAIO
windir -> C:\Windows
SystemRoot -> C:\Windows
NUMBER_OF_PROCESSORS -> 4
USERNAME -> pantelis
PUBLIC -> C:\Users\Public
PSModulePath -> C:\Windows\system32\WindowsPowerShell\v1.0\Modules\
CommonProgramFiles(x86) -> C:\Program Files (x86)\Common Files
ComSpec -> C:\Windows\system32\cmd.exe
APPDATA -> C:\Users\pantelis\AppData\Roaming

下面是我使用 Maven 运行时的环境变量:

USERPROFILE -> C:\Users\pantelis
JAVA_HOME -> C:\Program Files\Java\jdk1.7.0_04
PROGRAMDATA -> C:\ProgramData
MAVEN_CMD_LINE_ARGS -> "-Dexec.args=-classpath %classpath com.mycompany.mvntest.App" "-Dexec.executable=C:\Program Files\Java\jdk1.7.0_04\bin\java.exe" -Dexec.classpathScope=runtime process-classes org.codehaus.mojo:exec-maven-plugin:1.2:exec
CONFIGSETROOT -> C:\Windows\ConfigSetRoot
COMMONPROGRAMFILES -> C:\Program Files\Common Files
PROCESSOR_REVISION -> 2505
USERDOMAIN -> pantelis-VAIO
ALLUSERSPROFILE -> C:\ProgramData
PROGRAMW6432 -> C:\Program Files
SESSIONNAME -> Console
TMP -> C:\Users\pantelis\AppData\Local\Temp
PSMODULEPATH -> C:\Windows\system32\WindowsPowerShell\v1.0\Modules\
NB_EXEC_MAVEN_PROCESS_UUID -> b5daa24f-51dc-48ac-ad6d-820dc245b80a
M2_HOME -> C:\Program Files\NetBeans 7.1.2\java\maven\bin\..
LOGONSERVER -> \\PANTELIS-VAIO
=:: -> ::\
PATH -> C:\Program Files (x86)\MiKTeX 2.9\miktex\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\WIDCOMM\Bluetooth Software\syswow64;\;C:\Program Files (x86)\Sony\VAIO Startup Setting Tool;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\LINGO9\;C:\Program Files (x86)\OpenVPN\bin
PROMPT -> $P$G
COMMONPROGRAMW6432 -> C:\Program Files\Common Files
PROCESSOR_LEVEL -> 6
LOCALAPPDATA -> C:\Users\pantelis\AppData\Local
COMPUTERNAME -> PANTELIS-VAIO
CLASSWORLDS_LAUNCHER -> org.codehaus.plexus.classworlds.launcher.Launcher
USERNAME -> pantelis
APPDATA -> C:\Users\pantelis\AppData\Roaming
WINDIR -> C:\Windows
PATHEXT -> .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
PROGRAMFILES(X86) -> C:\Program Files (x86)
TEMP -> C:\Users\pantelis\AppData\Local\Temp
HOMEDRIVE -> C:
SYSTEMDRIVE -> C:
=C: -> C:\Users\pantelis\Documents\NetBeansProjects\MVNTest
ERROR_CODE -> 0
COMMONPROGRAMFILES(X86) -> C:\Program Files (x86)\Common Files
CLASSWORLDS_JAR -> "C:\Program Files\NetBeans 7.1.2\java\maven\bin\..\boot\plexus-classworlds-2.4.jar"
PROCESSOR_IDENTIFIER -> Intel64 Family 6 Model 37 Stepping 5, GenuineIntel
MAVEN_JAVA_EXE -> "C:\Program Files\Java\jdk1.7.0_04\bin\java.exe"
CLASSPATH -> C:\LINGO9\Lingo9_0.jar
PROCESSOR_ARCHITECTURE -> AMD64
FP_NO_HOST_CHECK -> NO
OS -> Windows_NT
HOMEPATH -> \Users\pantelis
COMSPEC -> C:\Windows\system32\cmd.exe
PROGRAMFILES -> C:\Program Files
HOME -> C:\Users\pantelis
NUMBER_OF_PROCESSORS -> 4
PUBLIC -> C:\Users\Public
SYSTEMROOT -> C:\Windows

Answer 1

更新后，根据从 maven 运行时出现的错误，似乎某些(类)路径设置不正确:RDCOMClient 似乎与 R 相关，所以它是用于运行 Rscript 的设置.exe 就是问题所在。

打印出ant运行时和maven下运行时的环境变量，并进行对比，判断缺失库错误的来源

评论更新:

问题可能与项目如何从 maven 执行有关:exec:exec 启动一个新的 JVM，而 exec:java 在同一个 JVM 中运行项目正在运行 maven。

评论更新:

显然，NetBeans 中的“保存时编译”设置将 Maven 目标从 exec:exec 更改为 exec:java。或者，您可以手动配置 pom.xml(请参阅 exec maven plugin 页面，其中包含两个目标的示例和描述)