Java Create Directory Runtime WebApp

Question

I have a webapp in Java SEAM2 running on JBOSS.

In my application I am trying to create directories on the fly / runtime.

Well what happens is that these directories get created, but when I try to write a file into them it throws a null pointer exception. So restarted my server and all works well then, why is it ?

if(ClassName.class.getClassLoader().getResource("roles/" + role ) == null)
        {
            //create directory with role name
            String rolePath = ClassName.class.getClassLoader().getResource("roles").getPath();
            rolePath = rolePath.substring(1, rolePath.length());
            rolePath = rolePath.replace("/", "\\");
            rolePath = rolePath + "\\" + role;

            if( !(new File(rolePath).mkdir()))
            {
                this.addMessage(FacesMessage.SEVERITY_ERROR, "Error Creating Role Directory");
                return;
            }

        }



        if(ClassName.class.getClassLoader().getResource("roles/" + role + "/" + app ) == null)
        {
            String appPath = ClassName.class.getClassLoader().getResource("roles/" + role).getPath();
            appPath = appPath.substring(1, appPath.length());
            appPath = appPath.replace("/", "\\");
            appPath = appPath + "\\" + app;

            File appFolder = new File(appPath);
            if( !(appFolder.mkdir()))
            {
                this.addMessage(FacesMessage.SEVERITY_ERROR, "Error Creating Role Directory");
                return;
            }


        }

My guess is that since I am using getClassLoader it is not getting updated with the new files created

Maybe you should post relevant code snippet.

Raghuram
– Raghuram

2010-10-18 05:53:08 +00:00
Commented Oct 18, 2010 at 5:53 — Raghuram
– Raghuram, Commented Oct 18, 2010 at 5:53

dennis · Accepted Answer · 2011-04-26 10:23:23Z

1

It is a bad idea to create a folder base a resource path from class loader (you never where is the srouce/folder from) better way are, use java.io.temp folder, or use a configuration to know get repository folder in your system.

answered Apr 26, 2011 at 10:23

dennis

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