XWIKI-10829: Executing the import mojo after the package mojo in the same...

XWIKI-10829: Executing the import mojo after the package mojo in the same reactor causes the build to fail

Fixed.

xwiki-platform-tools/xwiki-platform-tool-packager-plugin/src/main/java/com/xpn/xwiki/tool/backup/ImportMojo.java

@@ -61,6 +61,7 @@
 import org.xwiki.extension.version.internal.DefaultVersionConstraint;
 import org.xwiki.properties.ConverterManager;
 import org.xwiki.tool.utils.LogUtils;
+import org.hibernate.cfg.Environment;
 
 import com.xpn.xwiki.XWikiContext;
 
@@ -149,6 +150,9 @@ public void execute() throws MojoExecutionException, MojoFailureException
         Importer importer = new Importer();
 
         System.setProperty("xwiki.data.dir", this.xwikiDataDir.getAbsolutePath());
+        // If the package mojo was executed before, it might have left a different database connection URL in the
+        // environment, which apparently overrides the value in the configuration file
+        System.clearProperty(Environment.URL);
 
         if (this.sourceDirectory != null) {
             try {