package de.cpg.oss.verita.configuration.event_store;

import de.cpg.oss.verita.configuration.VeritaProperties;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;

@Data
@ConfigurationProperties(prefix = VeritaEventStoreProperties.CONFIG_PREFIX, ignoreUnknownFields = true)
public class VeritaEventStoreProperties {

    public static final String CONFIG_PREFIX = VeritaProperties.CONFIG_PREFIX + ".eventstore";

    private String username = "admin";

    private String password = "changeit";

    private String hostname = "localhost";

    private int port = 1113;

    private int maxEventsToLoad = 100;
}

package de.cpg.oss.verita.configuration.event_store;

import de.cpg.oss.verita.configuration.VeritaProperties;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;

@Data
@ConfigurationProperties(prefix = VeritaEventStoreProperties.CONFIG_PREFIX, ignoreUnknownFields = true)
public class VeritaEventStoreProperties {

    public static final String CONFIG_PREFIX = VeritaProperties.CONFIG_PREFIX + ".eventstore";

    private final String username = "admin";

    private final String password = "changeit";

    private final String hostname = "localhost";

    private final int port = 1113;

    private final int maxEventsToLoad = 100;
}

--- 
+++ 
@@ -10,13 +10,13 @@
 
     public static final String CONFIG_PREFIX = VeritaProperties.CONFIG_PREFIX + ".eventstore";
 
-    private final String username = "admin";
+    private String username = "admin";
 
-    private final String password = "changeit";
+    private String password = "changeit";
 
-    private final String hostname = "localhost";
+    private String hostname = "localhost";
 
-    private final int port = 1113;
+    private int port = 1113;
 
-    private final int maxEventsToLoad = 100;
+    private int maxEventsToLoad = 100;
 }
Remove final modifier since it prevents overriding properties
