What I want to do is invoke maven from a groovy script. The groovy script in question is used as a maven wrapper to build J2EE projects by downloading a tag and invoking maven on what was downloaded. How should I accomplish invoking maven to build/package the EAR (the groovy script is already capable of downloading the tag from SCM).
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4 Answers
The simplest way to invoke an external process in Groovy is to use the execute() command on a string. For example, to execute maven from a groovy script run this:
"cmd /c mvn".execute()
If you want to capture the output of the command and maybe print it out, you can do this:
print "cmd /c mvn".execute().text
The 'cmd /c' at the start invokes the Windows command shell. Since mvn.bat is a batch script you need this. For Unix you can invoke the system shell.
It is as simple as doing
"yourCommand".execute();
If you want to get print outputs on the executed command on standard output you can do
def proc = "yourCommand".execute();
proc.waitForProcessOutput(System.out, System.err);
If you want to store and process the output you can do
def proc = "yourCommand".execute();
def outputStream = new StringBuffer();
proc.waitForProcessOutput(outputStream, System.err);
println(outputStream.toString());
UPDATE:
Also you can set working dir by
File workingDir = file("<path to dir>")
def proc = "yourCommand".execute([], workingDir.absolutePath);
1 Comment
user641887
when I do this def homeDir = "c:/test/server"; def workDir = "${homeDir}/workDir"; def tempDir = "${workDir}/tmp"; println(homeDir); println(workDir); runShell("cd c:"); //runShell("mkdir -p ${tempDir}"); void runShell(String s) { def execute = s.execute(); execute.waitForProcessOutput(System.out,System.err); def value = execute.exitValue(); if (val > 0) { throw new Exception("Exit value: ${value}"); } } I get an error as below java.io.IOException: Cannot run program "cd": CreateProcess error=2, The system cannot find the file specified
For Java 7+ stdio redirection:
new ProcessBuilder('cmd', …args…).redirectOutput(ProcessBuilder.Redirect.INHERIT).start().waitFor();
You may use Runtime class to launch a shell command. take a look here: http://java.sun.com/javase/6/docs/api/java/lang/Runtime.html#exec(java.lang.String) You may later capture the results of the Process execution (to find out if it failed or not).
