Exception Handler auto-detection

Author: juanpablo-santos

README.md

@@ -36,8 +36,9 @@ By default, Stripes Dynamic Filter map to `/*`, whereas Stripes Filter maps to `
 * [2.0.0](https://github.com/juanpablo-santos/stripes-spring-boot/releases/tag/2.0.0)
   * [Support for Spring Boot 2](https://github.com/juanpablo-santos/stripes-spring-boot/issues/4)
   * New Stripes Actuator Endpoint detailing Stripes' filters configuration
+  * Exception Handler autodetection
   * Can run side by side with Spring MVC, no need to set any property on your `application.properties` file
-  * Faster startup time if `stripes.action-resolver-packages` is set on your `application.properties` file
+  * Faster startup time if `stripes.action-resolver-packages` and/or `stripes.exception-handler` are set on your `application.properties` file
 
 * [1.1.0](https://github.com/juanpablo-santos/stripes-spring-boot/releases/tag/1.1.0)
   * Update to latest 1.5 Spring Boot release

stripes-spring-boot-autoconfigure/src/main/java/net/sourceforge/stripes/springboot/autoconfigure/StripesAutoConfiguration.java

@@ -25,6 +25,7 @@
 import net.sourceforge.stripes.action.ActionBean;
 import net.sourceforge.stripes.controller.DynamicMappingFilter;
 import net.sourceforge.stripes.controller.StripesFilter;
+import net.sourceforge.stripes.exception.ExceptionHandler;
 import net.sourceforge.stripes.util.Log;
 
 
@@ -58,9 +59,7 @@ public StripesEndpoint stripesEndpoint( final FilterRegistrationBean< StripesFil
     @Bean( name = "stripesFilter" )
     @ConditionalOnMissingBean( name = "stripesFilter" )
     public FilterRegistrationBean< StripesFilter > stripesFilter( @Qualifier( "urlPatternsForStripesFilter" ) final List< String > urlPatternsForStripesFilter ) {
-        final StripesFilter filter = new StripesFilter();
-
-        final Map< String, String > params = new HashMap< String, String >();
+        final Map< String, String > params = new HashMap<>();
         setActionResolverPackages( params, "ActionResolver.Packages", properties.getActionResolverPackages() );
         putIfNotEmpty( params, "ActionBeanPropertyBinder.Class", properties.getActionBeanPropertyBinder() );
         putIfNotEmpty( params, "ActionBeanContext.Class", properties.getActionBeanContext() );
@@ -93,7 +92,7 @@ public FilterRegistrationBean< StripesFilter > stripesFilter( @Qualifier( "urlPa
         }
 
         final FilterRegistrationBean< StripesFilter > registration = new FilterRegistrationBean<>();
-        registration.setFilter( filter );
+        registration.setFilter( new StripesFilter() );
         registration.setInitParameters( params );
         registration.setUrlPatterns( urlPatternsForStripesFilter );
         registration.setDispatcherTypes( DispatcherType.REQUEST );
@@ -104,10 +103,8 @@ public FilterRegistrationBean< StripesFilter > stripesFilter( @Qualifier( "urlPa
     @Bean( name = "stripesDynamicFilter" )
     @ConditionalOnMissingBean( name = "stripesDynamicFilter" )
     public FilterRegistrationBean< DynamicMappingFilter > stripesDynamicFilter( @Qualifier( "urlPatternsForStripesDynamicFilter" ) final List< String > urlPatternsForStripesDynamicFilter ) {
-        final DynamicMappingFilter filter = new DynamicMappingFilter();
-
         final FilterRegistrationBean< DynamicMappingFilter > registration = new FilterRegistrationBean<>();
-        registration.setFilter( filter );
+        registration.setFilter( new DynamicMappingFilter() );
         registration.setUrlPatterns( urlPatternsForStripesDynamicFilter );
         registration.setDispatcherTypes( DispatcherType.REQUEST, DispatcherType.INCLUDE, DispatcherType.FORWARD, DispatcherType.ERROR );
         registration.setOrder( Ordered.LOWEST_PRECEDENCE );
@@ -117,15 +114,15 @@ public FilterRegistrationBean< DynamicMappingFilter > stripesDynamicFilter( @Qua
     @Bean( "urlPatternsForStripesFilter" )
     @ConditionalOnMissingBean( name = "urlPatternsForStripesFilter" )
     public List< String > urlPatternsForStripesFilter() {
-        final List< String > urlPatterns = new ArrayList< String >();
+        final List< String > urlPatterns = new ArrayList<>();
         urlPatterns.add( "*.jsp" );
         return urlPatterns;
     }
 
     @Bean( "urlPatternsForStripesDynamicFilter" )
     @ConditionalOnMissingBean( name = "urlPatternsForStripesDynamicFilter" )
     public List< String > urlPatternsForStripesDynamicFilter() {
-        final List< String > urlPatterns = new ArrayList< String >();
+        final List< String > urlPatterns = new ArrayList<>();
         urlPatterns.add( "/*" );
         return urlPatterns;
     }
@@ -139,7 +136,7 @@ void setActionResolverPackages( final Map< String, String > params, final String
     }
 
     String locateActionResolverPackages() {
-        final StripesClassesScanner< ActionBean > scanner = new StripesClassesScanner< ActionBean >();
+        final StripesClassesScanner< ActionBean > scanner = new StripesClassesScanner<>();
         scanner.addIncludeFilter( new AssignableTypeFilter( ActionBean.class ) );
         final Collection< Class< ? extends ActionBean > > actionbeans = scanner.findComponentClasses( BASE_PKG );
         final String packages = scanner.toPackagesWithoutStripesClasses( actionbeans );
@@ -152,6 +149,29 @@ String locateActionResolverPackages() {
         return packages;
     }
 
+    void setExceptionHandler( final Map< String, String > params, final String key, final String value ) {
+        if( StringUtils.isEmpty( value ) ) {
+            putIfNotEmpty( params, key, locateExceptionHandler() );
+        } else {
+            putIfNotEmpty( params, key, value );
+        }
+    }
+
+    String locateExceptionHandler() {
+        final StripesClassesScanner< ExceptionHandler > scanner = new StripesClassesScanner<>();
+        scanner.addIncludeFilter( new AssignableTypeFilter( ExceptionHandler.class ) );
+        final Collection< Class< ? extends ExceptionHandler > > exceptionHandlers = scanner.findComponentClasses( BASE_PKG );
+        final String exceptionHandler = scanner.selectFirstConcreteConfigurationClass( exceptionHandlers );
+        if( !StringUtils.isEmpty( exceptionHandler ) ) {
+            LOG.warn( "Didn't found any ExceptionHandler, defaulting to net.sourceforge.stripes.exception.DefaultExceptionHandler;" +
+                      "check your application build and optionally your stripes.exception-handler property on application.properties" );
+            return null;
+        } else {
+            LOG.info( "Detected ExceptionHandlers on " + scanner.toPackagesWithoutStripesClasses( exceptionHandlers ) + " selected " + exceptionHandler );
+            return exceptionHandler;
+        }
+    }
+
     void defaultIfEmpty( final Map< String, String > params, final String key, final String value, final String def ) {
         if( StringUtils.isEmpty( value ) ) {
             putIfNotEmpty( params, key, def );

stripes-spring-boot-autoconfigure/src/main/java/net/sourceforge/stripes/springboot/autoconfigure/StripesClassesScanner.java

@@ -1,6 +1,7 @@
 package net.sourceforge.stripes.springboot.autoconfigure;
 
 import java.io.IOException;
+import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -106,6 +107,15 @@ String toPackagesWithoutStripesClasses( final Collection< Class< ? extends T > >
         return StringUtils.collectionToCommaDelimitedString( packages );
     }
 
+    public String selectFirstConcreteConfigurationClass( final Collection< Class< ? extends T > > classes ) {
+        for( final Class< ? extends T > clase : classes ) {
+            if( !fromStripesLibrary( clase ) && !Modifier.isAbstract( clase.getModifiers() ) && !clase.isInterface() ) {
+                return clase.getName();
+            }
+        }
+        return null;
+    }
+
     String toPackages( final Collection< Class< ? extends T > > classes ) {
         final Set< String > packages = new HashSet< String >();
         for( final Class< ? extends T > clase : classes ) {

stripes-spring-boot-sample/pom.xml

@@ -17,6 +17,7 @@
 
   <properties>
     <build.timestamp>${maven.build.timestamp}</build.timestamp>
+    <maven.build.timestamp.format>yyyy-MM-dd HH:mm:ss</maven.build.timestamp.format>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
   </properties>

stripes-spring-boot-sample/src/main/resources/application.properties

@@ -1,9 +1,9 @@
 # after either mvn spring-boot:run or java-jar target/stripes-spring-boot-sample-1.0.0.jar 
-# open http://localhost:8080/index.jsp in your browser
+# open http://localhost:8080/index.jsp or http://localhost:8080/actuator/stripes in your browser
 
-# uncomment the following line to substantially speed up initialization time
-# stripes.action-resolver-packages=net.sourceforge.stripes.examples.springboot
+# uncomment the following lines to substantially speed up initialization time
+stripes.action-resolver-packages=net.sourceforge.stripes.examples.springboot
+stripes.exception-handler=net.sourceforge.stripes.exception.DefaultExceptionHandler
 
 # enforce same encryption key if running several app instances:
-stripes.encryption-key=${build.timestamp}
 management.endpoints.web.exposure.include=info,health,stripes