diff --git a/src/main/java/eu/hbp/mip/configuration/PersistenceConfiguration.java b/src/main/java/eu/hbp/mip/configuration/PersistenceConfiguration.java
index 475fd93d377ae52242194b3a3639f8bd29a61585..ca6ecdffd2fdcbedbb297d63ae77ac1b1cf27ea1 100644
--- a/src/main/java/eu/hbp/mip/configuration/PersistenceConfiguration.java
+++ b/src/main/java/eu/hbp/mip/configuration/PersistenceConfiguration.java
@@ -30,33 +30,33 @@ public class PersistenceConfiguration {
     @Primary
     @Bean(name = "portalDatasource")
     @ConfigurationProperties(prefix="spring.portalDatasource")
-    public DataSource portalDataSource() {
+    private DataSource portalDataSource() {
         return DataSourceBuilder.create().build();
     }
 
     @Bean(name = "metaDatasource")
     @ConfigurationProperties(prefix="spring.metaDatasource")
-    public DataSource metaDataSource() {
+    private DataSource metaDataSource() {
         return DataSourceBuilder.create().build();
     }
 
     @Bean(name = "scienceDatasource")
     @ConfigurationProperties(prefix="spring.scienceDatasource")
-    public DataSource scienceDataSource() {
+    private DataSource scienceDataSource() {
         return DataSourceBuilder.create().build();
     }
 
     @Bean
     @Autowired
     @Qualifier("metaJdbcTemplate")
-    public JdbcTemplate metaJdbcTemplate() {
+    private JdbcTemplate metaJdbcTemplate() {
         return new JdbcTemplate(metaDataSource());
     }
 
     @Bean
     @Autowired
     @Qualifier("scienceJdbcTemplate")
-    public JdbcTemplate scienceJdbcTemplate() {
+    private JdbcTemplate scienceJdbcTemplate() {
         return new JdbcTemplate(scienceDataSource());
     }
 
diff --git a/src/main/java/eu/hbp/mip/controllers/AppsApi.java b/src/main/java/eu/hbp/mip/controllers/AppsApi.java
index c544d492f64f8fce437c9490f3c93c1810c15150..8a61f04cda468e524c5d4ec8dc5a4d0e9e7b1afe 100644
--- a/src/main/java/eu/hbp/mip/controllers/AppsApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/AppsApi.java
@@ -33,16 +33,16 @@ public class AppsApi {
     private static final Logger LOGGER = Logger.getLogger(AppsApi.class);
 
     @Autowired
-    SecurityConfiguration securityConfiguration;
+    private SecurityConfiguration securityConfiguration;
 
     @Autowired
-    AppRepository appRepository;
+    private AppRepository appRepository;
 
     @Autowired
-    VoteRepository voteRepository;
+    private VoteRepository voteRepository;
 
     @Autowired
-    UserRepository userRepository;
+    private UserRepository userRepository;
 
     @ApiOperation(value = "Get apps", response = App.class, responseContainer = "List")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "Success") })
diff --git a/src/main/java/eu/hbp/mip/controllers/ArticlesApi.java b/src/main/java/eu/hbp/mip/controllers/ArticlesApi.java
index 8243c377cc6f2e70d93f05a91f28a0287383a511..024b49b076eccfc2e213c54ca757f5979fdaa4bb 100644
--- a/src/main/java/eu/hbp/mip/controllers/ArticlesApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/ArticlesApi.java
@@ -32,10 +32,10 @@ public class ArticlesApi {
     private static final Logger LOGGER = Logger.getLogger(ArticlesApi.class);
 
     @Autowired
-    SecurityConfiguration securityConfiguration;
+    private SecurityConfiguration securityConfiguration;
 
     @Autowired
-    ArticleRepository articleRepository;
+    private ArticleRepository articleRepository;
 
     @ApiOperation(value = "Get articles", response = Article.class, responseContainer = "List")
     @ApiResponses(value = { @ApiResponse(code = 200, message = "Success") })
diff --git a/src/main/java/eu/hbp/mip/controllers/DatasetsApi.java b/src/main/java/eu/hbp/mip/controllers/DatasetsApi.java
index 30e562bbf56bd8543cbfe2e2e168a9edd718f81f..ebbef8d5ec675c2ae25c9e478ea1a0c0a4f885f5 100644
--- a/src/main/java/eu/hbp/mip/controllers/DatasetsApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/DatasetsApi.java
@@ -26,7 +26,7 @@ public class DatasetsApi {
     private static final Logger LOGGER = Logger.getLogger(DatasetsApi.class);
 
     @Autowired
-    DatasetRepository datasetRepository;
+    private DatasetRepository datasetRepository;
 
     @ApiOperation(value = "Get a dataset", response = Dataset.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "Success") })
diff --git a/src/main/java/eu/hbp/mip/controllers/ExperimentApi.java b/src/main/java/eu/hbp/mip/controllers/ExperimentApi.java
index 9ce3274f87cb3f2524d1c4d9d59a00b07bf695b8..9ec76e3aa0e494dae2995921591a50ac02d77ce0 100644
--- a/src/main/java/eu/hbp/mip/controllers/ExperimentApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/ExperimentApi.java
@@ -60,13 +60,13 @@ public class ExperimentApi {
     private String miningExaremeQueryUrl;
 
     @Autowired
-    SecurityConfiguration securityConfiguration;
+    private SecurityConfiguration securityConfiguration;
 
     @Autowired
-    ModelRepository modelRepository;
+    private ModelRepository modelRepository;
 
     @Autowired
-    ExperimentRepository experimentRepository;
+    private ExperimentRepository experimentRepository;
 
 
     @ApiOperation(value = "Send a request to the workflow to run an experiment", response = Experiment.class)
diff --git a/src/main/java/eu/hbp/mip/controllers/ModelsApi.java b/src/main/java/eu/hbp/mip/controllers/ModelsApi.java
index 200ea9828aed350652a948d888bb038223ae6036..6066eb20598d5e4ba33b76dd4a6cb9c8d2c07595 100644
--- a/src/main/java/eu/hbp/mip/controllers/ModelsApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/ModelsApi.java
@@ -37,22 +37,22 @@ public class ModelsApi {
     private static final Logger LOGGER = Logger.getLogger(ModelsApi.class);
 
     @Autowired
-    SecurityConfiguration securityConfiguration;
+    private SecurityConfiguration securityConfiguration;
 
     @Autowired
-    DatasetRepository datasetRepository;
+    private DatasetRepository datasetRepository;
 
     @Autowired
-    ModelRepository modelRepository;
+    private ModelRepository modelRepository;
 
     @Autowired
-    QueryRepository queryRepository;
+    private QueryRepository queryRepository;
 
     @Autowired
-    ConfigRepository configRepository;
+    private ConfigRepository configRepository;
 
     @Autowired
-    VariableRepository variableRepository;
+    private VariableRepository variableRepository;
 
     @Autowired
     @Qualifier("scienceJdbcTemplate")
diff --git a/src/main/java/eu/hbp/mip/controllers/StatsApi.java b/src/main/java/eu/hbp/mip/controllers/StatsApi.java
index 3601b617b7375c2e4721b3ff3d29735470de61c8..50232c3e49468c0de937c0d423961df7cb7fdc8c 100644
--- a/src/main/java/eu/hbp/mip/controllers/StatsApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/StatsApi.java
@@ -31,10 +31,10 @@ public class StatsApi {
     private static final Logger LOGGER = Logger.getLogger(StatsApi.class);
 
     @Autowired
-    UserRepository userRepository;
+    private UserRepository userRepository;
 
     @Autowired
-    ArticleRepository articleRepository;
+    private ArticleRepository articleRepository;
 
     @Autowired
     @Qualifier("scienceJdbcTemplate")
diff --git a/src/main/java/eu/hbp/mip/controllers/UsersApi.java b/src/main/java/eu/hbp/mip/controllers/UsersApi.java
index 13a8f54e560f726d6b29087ceac79f6f0a16d13e..c046065bfa72623619065a9d96fa99923dd01b99 100644
--- a/src/main/java/eu/hbp/mip/controllers/UsersApi.java
+++ b/src/main/java/eu/hbp/mip/controllers/UsersApi.java
@@ -25,7 +25,7 @@ public class UsersApi {
     private static final Logger LOGGER = Logger.getLogger(UsersApi.class);
 
     @Autowired
-    UserRepository userRepository;
+    private UserRepository userRepository;
 
     @ApiOperation(value = "Get a user", response = User.class)
     @ApiResponses(value = { @ApiResponse(code = 200, message = "Found"), @ApiResponse(code = 404, message = "Not found") })