I have been trying to execute a set of commands in a powershell session through java, with no luck yet. My aim is to search a computer object in AD with the domain = "domain.com".
I started with a single command. Unfortunately, the following command successfully runs in my powershell prompt:
Get-ADComputer -Filter { Name -like "hostname" } –Server a.b.c.d:3268 -SearchBase 'DC=domain,DC=com' | FT DNSHostName
# hostname is actual hostname provided by user and accepted in argument of Java methods
# a.b.c.d is the IP-Address of my domain controller, and I'm trying to search a computer object in AD with the domain = "domain.com".
But, it produces different exceptions/errors with 2 different approaches.
I have tried the basic way of executing powershell commands, and then passing the command as argument to it. That did not work, resulted in different error described below.
Next, I tried using jPowerShell library (profesorfalken) with no luck again. Check the error in the last
Code for first attempt:
public String executeCommand(String hostname){
String output = "";
try{
// String firstPartCommand = "Get-ADComputer -Filter { Name -like (", secondPartCommand = ") } –Server a.b.c.d:3268 -SearchBase 'DC=domain,DC=com' | FT DNSHostName";
String firstPartCommand = "Get-ADComputer -Filter { Name -like \""+hostname+"\" } –Server a.b.c.d:3268 -SearchBase \'DC=domain,DC=com\' | FT DNSHostName";
Runtime rt = Runtime.getRuntime();
String[] cmds = new String[]{
"powershell.exe", firstPartCommand.trim()
};
System.out.println(firstPartCommand);
Process pr = rt.exec(cmds);
pr.getOutputStream().close();
BufferedReader stdInput = new BufferedReader(new InputStreamReader(pr.getInputStream()));
BufferedReader stdError = new BufferedReader(new InputStreamReader(pr.getErrorStream()));
System.out.println("Here is the standard output of the command:\n");
String s = null;
while ((s = stdInput.readLine()) != null) {
System.out.println(s+" -> OUTPUT");
output+=s;
//displayTF.setText(s);
}
stdInput.close();
System.out.println("Here is the standard error of the command (if any):\n");
while ((s = stdError.readLine()) != null) {
System.out.println(s+" -> ERROR");
}
stdError.close();
return output;
}
catch(Exception ex){
ex.printStackTrace(System.out);
output = "Some exception occured, SORRY!";
return output;
}
}
Output:
Get-ADComputer -Filter { Name -like "hostname" } –Server a.b.c.d:3268 -SearchBase 'DC=domain,DC=com' | FT DNSHostName
Here is the standard output of the command:
Here is the standard error of the command (if any):
Get-ADComputer : Error parsing query: ' Name -like hostname' Error Message: 'syntax error' at position: '13'. -> ERROR At line:1 char:1 -> ERROR + Get-ADComputer -Filter { Name -like hostname} -Server a.b.c.d ... -> ERROR + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -> ERROR + CategoryInfo : ParserError: (:) [Get-ADComputer], ADFilterParsingException -> ERROR + FullyQualifiedErrorId : ActiveDirectoryCmdlet:Microsoft.ActiveDirectory.Management.ADFilterParsingException,Micr -> ERROR osoft.ActiveDirectory.Management.Commands.GetADComputer -> ERROR -> ERROR
Code for second attempt:
public String execute(String hostname){
String output = "";
PowerShell powershell = null;
try{
powershell = PowerShell.openSession();
// String cmd = "$variable = \""+hostname+"\"";
// //Execute a command in PowerShell session
// PowerShellResponse response = powershell.executeCommand(cmd);
// //Print results
// System.out.println("Variable Initialisation:" + response.getCommandOutput());
String firstPartCommand = "Get-ADComputer -Filter { Name -like \"", secondPartCommand = "\" } –Server 10.0.239.236:3268 -SearchBase 'DC=AD,DC=SBI' | FT DNSHostName";
String finalCommand = firstPartCommand+hostname+secondPartCommand;
System.out.println(finalCommand);
PowerShellResponse response = powershell.executeCommand(finalCommand);
//PowerShellResponse response = powershell.executeCommand("Get-Process powershell -FileVersionInfo");
output = response.getCommandOutput();
System.out.println("Search result: "+hostname+"\n" + output);
return output;
}
catch(Exception ex){
return "Failed!";
}
finally {
//Always close PowerShell session to free resources.
if (powershell != null)
powershell.close();
}
}
Output:
Get-ADComputer -Filter { Name -like "hostname" } –Server a.b.c.d:3268 -SearchBase 'DC=domain,DC=com' | FT DNSHostName
Search result: hostname
Get-ADComputer : A positional parameter cannot be found that accepts argument '–Server'. At line:1 char:1 + Get-ADComputer -Filter { Name -like "hostname" } –Server a.b.c.d ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidArgument: (:) [Get-ADComputer], ParameterBindingException + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.ActiveDirectory.Management.Commands.GetADComputer
From what I've searched and understood, the hostname which is passed to the Java method is not getting treated as a string in the powershell. These errors are pertaining to powershell, which I'm not much experienced with.
EDIT: After Mathias R. Jessen's reply, I'm not getting any error in the 2nd case; but, it seems the library itself is not correct up to the mark.
So, talking about the first method, I'm getting the error as mentioned in the first case. I want to get on with the first method only!
I have, almost, lost my faith in the external jPowershell JAR. I'm not getting the error in the 2nd output; but, neither getting the output. It behaves as if there is no output of the command!
Request to kindly help me solve this problem!
After struggling for almost 3 days, I found the problem to be in the command string, as expected.
The correct command (for the first case) should be:
String firstPartCommand = "Get-ADComputer -Filter { Name -eq \'"+hostname+"\' }
-Server a.b.c.d:3268 -SearchBase \'DC=domain,DC=com\' | Select DNSHostName";
The correct command (for the second case) should be:
String firstPartCommand = "Get-ADComputer -Filter { Name -eq \'",
secondPartCommand = "\' } -Server a.b.c.d:3268 -SearchBase \'DC=domain,DC=com\' |
Select DNSHostName";