added static property support to GUI and fix setting gui endpoint

src/main/java/ch/ethz/seb/sebserver/gui/RAPConfiguration.java

@@ -42,6 +42,9 @@ public class RAPConfiguration implements ApplicationConfiguration {
     public void configure(final Application application) {
         try {
 
+            final String guiEntrypoint = StaticApplicationPropertyResolver
+                    .getProperty("sebserver.gui.entrypoint", "/gui");
+
             // TODO get file path from properties
             //application.addStyleSheet(RWT.DEFAULT_THEME_ID, "static/css/sebserver.css");
             application.addStyleSheet(DEFAULT_THEME_NAME, "resource/theme/default.css");
@@ -54,7 +57,7 @@ public class RAPConfiguration implements ApplicationConfiguration {
             properties.put(WebClient.BODY_HTML, "<big>Loading Application<big>");
             properties.put(WebClient.THEME_ID, DEFAULT_THEME_NAME);
             //        properties.put(WebClient.FAVICON, "icons/favicon.png");
-            application.addEntryPoint("/gui", new RAPSpringEntryPointFactory(), properties);
+            application.addEntryPoint(guiEntrypoint, new RAPSpringEntryPointFactory(), properties);
 
         } catch (final RuntimeException re) {
             throw re;

src/main/java/ch/ethz/seb/sebserver/gui/RAPSpringConfig.java

@@ -8,7 +8,9 @@
 
 package ch.ethz.seb.sebserver.gui;
 
-import ch.ethz.seb.sebserver.gbl.profile.GuiProfile;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletContextListener;
+
 import org.eclipse.rap.rwt.engine.RWTServlet;
 import org.eclipse.rap.rwt.engine.RWTServletContextListener;
 import org.slf4j.Logger;
@@ -22,8 +24,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.support.ReloadableResourceBundleMessageSource;
 
-import javax.servlet.ServletContext;
-import javax.servlet.ServletContextListener;
+import ch.ethz.seb.sebserver.gbl.profile.GuiProfile;
 
 @Configuration
 @GuiProfile
@@ -37,8 +38,14 @@ public class RAPSpringConfig {
     @Value("${sebserver.gui.external.messages:messages}")
     private String externalMessagesPath;
 
+    @Bean
+    public StaticApplicationPropertyResolver staticApplicationPropertyResolver() {
+        return new StaticApplicationPropertyResolver();
+    }
+
     @Bean
     public ServletContextInitializer initializer() {
+        staticApplicationPropertyResolver();
         return new RAPServletContextInitializer();
     }
 

src/main/java/ch/ethz/seb/sebserver/gui/StaticApplicationPropertyResolver.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2020 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.gui;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.BeansException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.core.env.Environment;
+
+public class StaticApplicationPropertyResolver implements ApplicationContextAware {
+
+    private static final Logger log = LoggerFactory.getLogger(StaticApplicationPropertyResolver.class);
+
+    private static ApplicationContext CONTEXT;
+
+    public StaticApplicationPropertyResolver() {
+        // TODO Auto-generated constructor stub
+    }
+
+    @Override
+    public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {
+        CONTEXT = applicationContext;
+    }
+
+    public static String getProperty(final String name, final String defaultValue) {
+        try {
+            final Environment env = CONTEXT.getBean(Environment.class);
+            return env.getProperty(name, defaultValue);
+        } catch (final Exception e) {
+            log.warn("Failed to get property: {} from static context. Return default value: {}", name, defaultValue);
+            return defaultValue;
+        }
+    }
+
+}