== How to fix it in Apache Commons

=== Code examples

include::../../common/fix/code-rationale.adoc[]

==== Noncompliant code example

[source,java,diff-id=1,diff-type=noncompliant]
----
@Controller
public class ExampleController
{
    @GetMapping(value = "/find")
    public void find(@RequestParam("filename") String filename) throws IOException {

        CommandLine cmd = new CommandLine("/usr/bin/find . -iname " + filename);
    }
}
----

==== Compliant solution

[source,java,diff-id=1,diff-type=compliant]
----
@Controller
public class ExampleController
{
    @GetMapping(value = "/find")
    public void find(@RequestParam("filename") String filename) throws IOException {

        CommandLine cmd = new CommandLine("/usr/bin/find");
        cmd.addArguments(new String[] {"/usr/bin/find", ".", "-iname", filename});
    }
}
----

=== How does this work?

include::../../common/fix/introduction.adoc[]

Here `org.apache.commons.exec.CommandLine.addArguments(String[] addArguments)` takes care of escaping the passed arguments and internally
creates a single string given to the operating system to be executed.
