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MavenDependencyCleaner.java
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MavenDependencyCleaner.java
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package com.cleaner.dependency;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.Model;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.apache.maven.model.io.xpp3.MavenXpp3Writer;
import org.apache.maven.shared.invoker.DefaultInvocationRequest;
import org.apache.maven.shared.invoker.DefaultInvoker;
import org.apache.maven.shared.invoker.InvocationRequest;
import org.apache.maven.shared.invoker.InvocationResult;
import org.apache.maven.shared.invoker.Invoker;
import org.apache.maven.shared.invoker.MavenInvocationException;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
import org.json.JSONException;
/**
* @author JUNAID B S
*
*/
public class MavenDependencyCleaner
{
static String line = "";
static String str = "";
static String projectPath;
static String jarEndString = "Tomcat started on port(s):";
public static void main(String[] args)
throws JSONException, MavenInvocationException, java.io.IOException, XmlPullParserException
{
if (args.length < 1)
{
System.out.println("invalid number of arguments project path (folder contains pom) required");
System.exit(0);
}
projectPath = args[0];
if (args.length == 2)
{
// customized jar stop statement
jarEndString = args[1];
}
try
{
// creating backup pom
File src = new File(projectPath + "pom.xml");
File dest = new File(projectPath + "backup_pom.xml");
Files.copy(src.toPath(), dest.toPath());
} catch (Exception e)
{
// exception will throw if backup file already exist
}
MavenXpp3Reader reader = new MavenXpp3Reader();
Model model = reader.read(new FileReader(projectPath + "pom.xml"));
List<Dependency> dependencies = model.getDependencies();
List<Dependency> tempDependencies = new ArrayList<>(dependencies);
String jarName = model.getArtifactId() + "-" + model.getVersion() + ".jar";
for (Dependency dependency : tempDependencies)
{
System.out.println(
"\n ------------------------Dependency: " + dependency.getArtifactId() + "----------------------");
model.removeDependency(dependency);
savepom(model);
try
{
if (!(buildJar() && checkJarRunnable(jarName)))
{
model.addDependency(dependency);
savepom(model);
System.out.println("-----------------used dependency deletion failed--------------------");
} else
{
System.out.println("------------------ unused dependency deletion succesfull-------------------");
}
} catch (MavenInvocationException e)
{
e.printStackTrace();
model.addDependency(dependency);
savepom(model);
}
}
}
private static void savepom(Model model)
{
try
{
new MavenXpp3Writer().write(new FileOutputStream(new File(projectPath, "pom.xml")), model);
} catch (java.io.IOException e)
{
e.printStackTrace();
}
}
private static boolean buildJar() throws MavenInvocationException
{
InvocationRequest request = new DefaultInvocationRequest();
request.setPomFile(new File(projectPath, "pom.xml"));
request.setGoals(Collections.singletonList("clean install -DskipTests"));
Invoker invoker = new DefaultInvoker();
invoker.setMavenHome(new File("apache-maven-3.8.6"));
InvocationResult result = invoker.execute(request);
if (result.getExitCode() != 0)
{
return false;
} else
{
System.out.println("-------------------jar builded successfully--------------------");
return true;
}
}
private static boolean checkJarRunnable(String jarName) throws java.io.IOException
{
ProcessBuilder processBuilder = new ProcessBuilder();
// Run a command
processBuilder.command("java", "-jar", projectPath + "/target/" + jarName);
try
{
boolean succesflag = false;
Process process = processBuilder.start();
StringBuilder output = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = reader.readLine()) != null)
{
output.append(line + "\n");
System.out.println(line);
if (line.contains(jarEndString))
{
succesflag = true;
process.destroy();
}
}
return succesflag;
} catch (IOException e)
{
e.printStackTrace();
}
return false;
}
}