From 1942da675ebbe29eddf4850a12f37b989e1daa5b Mon Sep 17 00:00:00 2001
From: Peter Palaga <ppalaga@redhat.com>
Date: Tue, 5 Feb 2019 19:31:14 +0100
Subject: [PATCH] Fix #235 NPE when there is no <url> under <license>

---
 .../license/AbstractDownloadLicensesMojo.java | 107 ++++++++++--------
 1 file changed, 58 insertions(+), 49 deletions(-)

diff --git a/src/main/java/org/codehaus/mojo/license/AbstractDownloadLicensesMojo.java b/src/main/java/org/codehaus/mojo/license/AbstractDownloadLicensesMojo.java
index 635b12f0e..7a348caef 100644
--- a/src/main/java/org/codehaus/mojo/license/AbstractDownloadLicensesMojo.java
+++ b/src/main/java/org/codehaus/mojo/license/AbstractDownloadLicensesMojo.java
@@ -890,72 +890,81 @@ private void downloadLicenses( LicenseDownloader licenseDownloader, ProjectLicen
             return;
         }
 
+        int licenseIndex = 0;
         for ( ProjectLicense license : licenses )
         {
-            final String licenseUrl = rewriteLicenseUrlIfNecessary( license.getUrl() );
-            try
+            if ( license.getUrl() == null )
             {
-
-                File licenseOutputFile = downloadedLicenseURLs.get( licenseUrl );
-                if ( licenseOutputFile == null )
+                handleError( depProject, "No URL for license at index " + licenseIndex + " in dependency "
+                                + depProject.toString() );
+            }
+            else
+            {
+                final String licenseUrl = rewriteLicenseUrlIfNecessary( license.getUrl() );
+                try
                 {
-                    final String licenseFileName;
-                    if ( license.getFile() != null )
-                    {
-                        licenseFileName = new File( license.getFile() ).getName();
-                    }
-                    else
-                    {
-                        licenseFileName = getLicenseFileName( depProject,
-                                                              new URL( license.getUrl() ),
-                                                              license.getName() );
-                    }
-                    licenseOutputFile = new File( licensesOutputDirectory, licenseFileName );
-                }
 
-                if ( !licenseOutputFile.exists() || forceDownload )
-                {
-                    if ( !downloadedLicenseURLs.containsKey( licenseUrl ) || organizeLicensesByDependencies )
+                    File licenseOutputFile = downloadedLicenseURLs.get( licenseUrl );
+                    if ( licenseOutputFile == null )
                     {
-                        final LicenseDownloadResult result =
-                            licenseDownloader.downloadLicense( licenseUrl, proxyLoginPasswordEncoded, licenseOutputFile,
-                                                               getLog() );
-
-                        if ( result.isSuccess() )
+                        final String licenseFileName;
+                        if ( license.getFile() != null )
                         {
-                            licenseOutputFile = result.getFile();
-                            downloadedLicenseURLs.put( licenseUrl, licenseOutputFile );
+                            licenseFileName = new File( license.getFile() ).getName();
                         }
                         else
                         {
-                            handleError( depProject, result.getErrorMessage() );
+                            licenseFileName = getLicenseFileName( depProject,
+                                                                  new URL( license.getUrl() ),
+                                                                  license.getName() );
                         }
+                        licenseOutputFile = new File( licensesOutputDirectory, licenseFileName );
+                    }
+
+                    if ( !licenseOutputFile.exists() || forceDownload )
+                    {
+                        if ( !downloadedLicenseURLs.containsKey( licenseUrl ) || organizeLicensesByDependencies )
+                        {
+                            final LicenseDownloadResult result =
+                                licenseDownloader.downloadLicense( licenseUrl, proxyLoginPasswordEncoded,
+                                                                   licenseOutputFile, getLog() );
 
+                            if ( result.isSuccess() )
+                            {
+                                licenseOutputFile = result.getFile();
+                                downloadedLicenseURLs.put( licenseUrl, licenseOutputFile );
+                            }
+                            else
+                            {
+                                handleError( depProject, result.getErrorMessage() );
+                            }
+
+                        }
+                    }
+
+                    if ( licenseOutputFile != null )
+                    {
+                        license.setFile( licenseOutputFile.getName() );
                     }
-                }
 
-                if ( licenseOutputFile != null )
+                }
+                catch ( URISyntaxException e )
                 {
-                    license.setFile( licenseOutputFile.getName() );
+                    handleError( depProject, "POM for dependency " + depProject.toString()
+                        + " has an invalid license URL: " + licenseUrl );
+                }
+                catch ( FileNotFoundException e )
+                {
+                    handleError( depProject, "POM for dependency " + depProject.toString()
+                                           + " has a license URL that returns file not found: " + licenseUrl );
+                }
+                catch ( IOException e )
+                {
+                    handleError( depProject, "Unable to retrieve license from URL '" + licenseUrl + "' for dependency '"
+                        + depProject.toString() + "': " + e.getMessage() );
                 }
-
-            }
-            catch ( URISyntaxException e )
-            {
-                handleError( depProject, "POM for dependency " + depProject.toString() + " has an invalid license URL: "
-                                       + licenseUrl );
-            }
-            catch ( FileNotFoundException e )
-            {
-                handleError( depProject, "POM for dependency " + depProject.toString()
-                                       + " has a license URL that returns file not found: " + licenseUrl );
-            }
-            catch ( IOException e )
-            {
-                handleError( depProject, "Unable to retrieve license from URL '" + licenseUrl + "' for dependency '"
-                    + depProject.toString() + "': " + e.getMessage() );
             }
-
+            licenseIndex++;
         }
 
     }