vmuzikar · May 18, 2026 · May 13, 2026
@@ -63,8 +63,8 @@ public class QuarkusKeycloakApplication extends KeycloakApplication {
     @Override
     protected String getDataDir() {
         return Environment.getDataDir().orElseGet(() -> {
-            logger.warnf("%s is not set, the system temporary directory will be used as the Keycloak data directory.", Environment.KC_HOME_DIR);
-            return System.getProperty("java.io.tmpdir");
+            logger.warnf("%s is not set", Environment.KC_HOME_DIR);
+            return null;
         });
     }
 

@@ -364,18 +364,20 @@ public static Path initTempDirectory(String name) {
         String buildDir = System.getProperty("project.build.directory");
         if (buildDir == null) {
             try {
-                return Files.createTempDirectory(name).toAbsolutePath();
+                Path tempDirectory = Files.createTempDirectory(name);
+                tempDirectory.toFile().deleteOnExit();
+                return tempDirectory.toAbsolutePath();
             } catch (IOException e) {
                 throw new RuntimeException("Could not create temporary directory", e);
             }
         } else {
-            Path homeDir = Path.of(buildDir, name);
+            Path tempDirectory = Path.of(buildDir, name);
             try {
-                FileUtils.deleteDirectory(homeDir.toFile());
+                FileUtils.deleteDirectory(tempDirectory.toFile());
             } catch (IOException e) {
                 e.printStackTrace();
             }
-            return homeDir;
+            return tempDirectory;
         }
     }
 

@@ -82,8 +82,9 @@ private synchronized File initCacheDir() {
             }
         }
 
-        if (!cacheDir.isDirectory() && !cacheDir.mkdirs()) {
-            logger.warn("Failed to create gzip cache directory");
+        cacheDir.mkdirs();
+        if (!cacheDir.isDirectory()) {
+            logger.warn("Failed to create gzip cache directory " + cacheDir.getAbsolutePath());
             return null;
         }
 

@@ -19,6 +19,7 @@
 import java.io.File;
 import java.time.Duration;
 import java.time.Instant;
+import java.util.Optional;
 import java.util.concurrent.TimeUnit;
 
 import jakarta.ws.rs.core.Application;
@@ -52,20 +53,21 @@ public abstract class KeycloakApplication extends Application {
 
     private static volatile DefaultKeycloakSessionFactory sessionFactory;
 
+    /**
+     * Get the temp directory as initialized by the current KeycloakApplication.
+     * <br>
     * The directory is not guaranteed to exist
+     */
     public static String getTmpDirectory() {
-        return System.getProperty(KC_TMPDIR, System.getProperty("java.io.tmpdir"));
+        return Optional.ofNullable(System.getProperty(KC_TMPDIR)).orElseThrow(() -> new RuntimeException("No temporary directory was configured."));
     }
 
     protected void initTmpDirectory() {
         String dataDir = getDataDir();
-        File tmpDir = new File(dataDir, "tmp");
-        tmpDir.mkdirs();
-        if (tmpDir.isDirectory()) {
-            logger.debugf("Using server tmp directory: %s", tmpDir.getAbsolutePath());
-        } else {
-            logger.warnf("Temporary directory %s does not exist and it was not possible to create it.", tmpDir.getAbsolutePath());
+        if (dataDir != null) {
+            File tmpDir = new File(dataDir, "tmp");
+            System.setProperty(KC_TMPDIR, tmpDir.getAbsolutePath());
         }
-        System.setProperty(KC_TMPDIR, tmpDir.getAbsolutePath());
     }
 
     protected abstract String getDataDir();

@@ -79,7 +79,7 @@ public ResteasyKeycloakApplication() {
 
     @Override
     protected String getDataDir() {
-        return System.getProperty("project.build.directory");
+        return System.getProperty("jboss.server.data.dir");
     }
 
     @Override

@@ -267,7 +267,12 @@
             <artifactId>mssql-jdbc</artifactId>
             <version>${mssql-jdbc.version}</version>
         </dependency>
-
+
+        <dependency>
+            <groupId>org.keycloak</groupId>
+            <artifactId>keycloak-junit5</artifactId>
+        </dependency>
+
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-micrometer</artifactId>

@@ -22,7 +22,6 @@
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
-import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.security.KeyStore;
 import java.text.SimpleDateFormat;
@@ -33,7 +32,6 @@
 import java.util.Map;
 import java.util.Properties;
 import java.util.function.Function;
-import java.util.stream.Stream;
 import javax.net.ssl.KeyManager;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
@@ -43,6 +41,7 @@
 import jakarta.servlet.DispatcherType;
 import jakarta.servlet.Filter;
 
+import org.keycloak.Keycloak;
 import org.keycloak.authentication.AuthenticatorSpi;
 import org.keycloak.authentication.authenticators.browser.DeployedScriptAuthenticatorFactory;
 import org.keycloak.authorization.policy.provider.PolicySpi;
@@ -321,24 +320,7 @@ public static String detectDataDirectory() {
         }
 
         // we generate a dynamic jboss.server.data.dir and remove it at the end.
-        try {
-          String tempKeycloakFolder = KeycloakApplication.getTmpDirectory();
-          File tmpDataDir = new File(tempKeycloakFolder, "/data");
-
-          if (tmpDataDir.mkdirs()) {
-            tmpDataDir.deleteOnExit();
-          } else try (Stream<Path> dir = Files.list(tmpDataDir.toPath())) {
-            if (dir.findAny().isPresent()) {    // Works well if directory is empty
-              throw new IOException("Could not create directory " + tmpDataDir);
-            }
-          }
-
-          dataPath = tmpDataDir.getAbsolutePath();
-        } catch (IOException ioe){
-          throw new RuntimeException("Could not create temporary " + JBOSS_SERVER_DATA_DIR, ioe);
-        }
-
-        return dataPath;
+        return Keycloak.initTempDirectory("keycloak-data").toFile().getAbsolutePath();
     }
 
     private KeycloakServerConfig config;