Spring Webflow 2.3.0 Samples unstartable... No Idea how to fix - java

I'm currently evaluating Spring (with a focus on WebFlow) for future projects. After reading lots of docs and articles (most of which didn't help much) I downloaded the current release of Spring WebFlow (2.3.0 at the time of writing) and tried to get the samples running. Apart from solvable, yet frustrating, dependency- and classpath-issues, I hit the first roadblock with the config-files distributed with the samples. First of all, the webflow-config.xml of the booking-mvc-sample isn't even valid.
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:webflow="http://www.springframework.org/schema/webflow-config"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/webflow-config
http://www.springframework.org/schema/webflow-config/spring-webflow-config.xsd">
<!-- Executes flows: the entry point into the Spring Web Flow system -->
<webflow:flow-executor id="flowExecutor">
<webflow:flow-execution-listeners>
<webflow:listener ref="securityFlowExecutionListener" />
</webflow:flow-execution-listeners>
</webflow:flow-executor>
<!-- The registry of executable flow definitions -->
<webflow:flow-registry id="flowRegistry" flow-builder-services="flowBuilderServices" base-path="/WEB-INF">
<webflow:flow-location-pattern value="/**/*-flow.xml" />
</webflow:flow-registry>
<!-- Plugs in a custom creator for Web Flow views -->
<webflow:flow-builder-services id="flowBuilderServices" view-factory-creator="mvcViewFactoryCreator"
development="true" validator="validator" />
<!-- Configures Web Flow to use Tiles to create views for rendering; Tiles allows for applying consistent layouts to your views -->
<bean id="mvcViewFactoryCreator" class="org.springframework.webflow.mvc.builder.MvcViewFactoryCreator">
<property name="viewResolvers" ref="tilesViewResolver"/>
<property name="useSpringBeanBinding" value="true" />
</bean>
<!-- Installs a listener to apply Spring Security authorities -->
<bean id="securityFlowExecutionListener" class="org.springframework.webflow.security.SecurityFlowExecutionListener" />
<!-- Bootstraps JSR-303 validation and exposes it through Spring's Validator interface -->
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
</beans>
cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'webflow:flow-executor'.
cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'webflow:flow-registry'.
cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'webflow:flow-builder-services'.
Changing http://www.springframework.org/schema/webflow-config/spring-webflow-config.xsd to http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.3.xsd removes the validation errors from Eclipse but the SAXParser still complains at startup.
Is there any way around it? Can someone help me out with a working config or point to a working tutorial (either a correct one if it's the samples fault or one that shown me how to setup SWF correctly if I'm doing it wrong)?
Right now I'm not far from dumping SWF from our list of possible frameworks as "not running out of the box" and - looking at the userbase and prevalence of Spring, this is somehow hard to believe.
Thanks a lot.

Related

Conditionally load a bean in spring boot using xml configuration?

I am using Spring Boot 2.1.
I have some mixed configuration in my project : XML files and java classes with annotations.
We have this current configuration which works :
application.properties :
spring.profiles.active=dev, component1, component2
applicationContext-file.xml :
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"
profile="component1">
<beans>
<bean id="myserviceimpl"
class="org.blabla.MyServiceImpl">
<property name="mydao">
<ref bean="mydao"></ref>
</property>
</bean>
</beans>
</beans>
We want to extract the component values from the spring.profiles.active property since they have nothing to do with the environment :
application.properties :
spring.profiles.active=dev
component1=true
component2=true
How can i condition the instantiation of the myserviceimpl bean inside the applicationContext-file.xml ?
I can no longer rely on the profile attribute since the spring.profiles.active property no longer includes
the values of the components.
Thanks for helping.
I haven't tried it by myself but I suggest to check the following:
Step 1
Create one XML file per profile (say, dev and prod for the sake of example):
app-config-dev.xml:
------------------
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"
profile="dev">
<beans>
<!-- here define only beans that you want to load in __dev__ environment -->
<bean id="myserviceimpl"
class="org.blabla.MyServiceImpl">
<property name="mydao">
<ref bean="mydao"></ref>
</property>
</bean>
</beans>
</beans>
app-config-prod.xml:
------------------
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd"
profile="prod">
<beans>
<!-- here define only beans that you want to load in __production__ environment -->
<bean id="myserviceimpl"
class="org.blabla.MyServiceProdImpl">
<property name="mydao">
<ref bean="mydao"></ref>
</property>
</bean>
</beans>
</beans>
Step 2
Now in your "primary" applicationContext-file.xml instead of defining beans directly, include all the xml files that you've created during the step 1:
<import resource="classpath:app-config-dev.xml" />
<import resource="classpath:app-config-prod.xml" />
Read this thread for more details on this step if needed
Step 3
Remove the component1=true and component2=true from aplication properties, you don't need it anymore, the profile itself defines which beans should be loaded.
Update 1
Based OP's first comment:
You probably can try another option but I consider it a "low-level" solution and it requires deep understanding of how does spring loading process work under the hood.
So when spring starts it finds the definitions of beans (in xml, java config, annotations like #Component and so forth) and creates out of all this information a BeanDefinition - a metadata object that aggregates all the information about the bean (for example whether its singleton or prototype). At this point no beans are not created yet. Lets call this point in time a "Bean Definitions Done" point" (for the sake of explanations, its my term out of my head...
Then spring starts to build a graph of dependencies and starts creating beans, initializing them (Autowiring, post-construct methods, and so on) and placing them onto application context (if they're singletons).
Now, in spring there is an option to provide a hook called BeanFactoryPostProcessor that is invoked exactly at the "Bean Definitions Done" point. This is basically a java code that implements some interface and by itself is a spring bean that spring treats in a special way.
So you can implement this interface and manipulate the results of Bean factory.
Namely you can access every bean definition that spring has opened and if you think that the bean of this definition should not be created (here comes your custom logic that would check properties, whatever) - remove the bean definition from the registry:
For technical method of removing bean definitions see this thread
Here is an example of Bean Factory Post processor that actually adds a new bean although it wasn't registered

Unable to locate ldaptive schema in CAS 4.2.x

I am new to the CAS setup, started using CAS 4.2.x version. With help of the below , doing the setup.
[https://apereo.github.io/cas/4.2.x/installation/LDAP-Authentication.html][1]
After adding bean reference "http://www.ldaptive.org/schema/spring-ext" in the deployerConfigcontext.xml, getting the error
Configuration problem: Unable to locate Spring Namespace handler for xml schema namespace [http://www.ldaptive.org/schema/spring-ext]
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:webflow="http://www.springframework.org/schema/webflow-config"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:c="http://www.springframework.org/schema/c"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:ldaptive="http://www.ldaptive.org/schema/spring-ext"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/webflow-config http://www.springframework.org/schema/webflow-config/spring-webflow-config-2.3.xsd
http://www.ldaptive.org/schema/spring-ext http://www.ldaptive.org/schema/spring-ext.xsd">
I am using CAS 3.5.2 and was facing the same issue ..... the below workaround worked for me. You can give it a shot and see if it works for you as well.
Add the following dependency in your pom.xml file
<dependency>
<groupId>org.jasig.cas</groupId>
<artifactId>cas-server-support-ldap</artifactId>
<version>${cas.version}</version>
</dependency>
then remove the below lines from your deployerConfigcontext.xml
xmlns:ldaptive="http://www.ldaptive.org/schema/spring-ext"
http://www.ldaptive.org/schema/spring-ext http://www.ldaptive.org/schema/spring-ext.xsd
In your deployerConfigcontext.xml remove the ldaptive declaration and replace it with the below format.
<bean id="contextSource" class="org.springframework.ldap.core.support.LdapContextSource">
<!-- DO NOT enable JNDI pooling for context sources that perform LDAP bind operations. -->
<property name="pooled" value="false"/>
<!--
Although multiple URLs may defined, it's strongly recommended to avoid this configuration
since the implementation attempts hosts in sequence and requires a connection timeout
prior to attempting the next host, which incurs unacceptable latency on node failure.
A proper HA setup for LDAP directories should use a single virtual host that maps to multiple
real hosts using a hardware load balancer.
-->
<property name="url" value="your-ldap-url" />
<!--
Manager credentials are only required if your directory does not support anonymous searches.
Never provide these credentials for FastBindLdapAuthenticationHandler since the user's
credentials are used for the bind operation.
-->
<property name="userDn" value="your-userDn-info"/>
<property name="password" value="password-for-your-userDn"/>
<!-- Place JNDI environment properties here. -->
<property name="baseEnvironmentProperties">
<map>
<!-- Three seconds is an eternity to users. -->
<entry key="com.sun.jndi.ldap.connect.timeout" value="3000" />
<entry key="com.sun.jndi.ldap.read.timeout" value="3000" />
<!-- Explained at http://docs.oracle.com/javase/jndi/tutorial/ldap/security/auth.html -->
<entry key="java.naming.security.authentication" value="simple" />
</map>
</property>
</bean>
Also in your deployerConfigcontext.xml remove your ldapAuthenticationHandler bean and replace it with the following
<bean class="org.jasig.cas.adaptors.ldap.BindLdapAuthenticationHandler"
p:filter="your-ldap-filter"
p:searchBase="your-search-base"
p:contextSource-ref="contextSource"
p:ignorePartialResultException="true" />
Please note that i am using CAS 3.5.2 so you might have to make some more changes ...

Conditionally including beans in XML ArrayList

I was wondering if it's possible to somehow conditionally include spring beans depending on some property.
In my applicationContext.xml I have a list of beans that I setup:
<bean id="server1Config" class="... />
<bean id="server2Config" class="... />
<bean id="server3Config" class="... />
...
Then I include them in a list:
<bean class="java.util.ArrayList">
<constructor-arg>
<list>
<ref bean="server1Config"/>
<ref bean="server2Config"/>
<ref bean="server3Config"/>
...
</list>
</constructor-arg>
</bean>
I want to conditionally include server1Config, server2Config, server3Config, etc depending on whether ${includeServer1} == true, ${includeServer2} == true etc and if possible, only initialize those beans if they are marked for inclusion.
To clarify, it's a ping service checking if servers are online or not, each bean contains special urls. If I have 5 servers running, I'd like to set in my config includeServer1=true ... includeServer5=true ... includeServer6=false, if I shutdown server2, I'd like to change includeServer2=false before shutting down the server to not get bombarded with SMSe telling me server2 is offline.
As your names refer to different stages or enviroments, spring profiles might be helpful to use. You can define beans like this inside your context.xml
<beans profile="dev">
<jdbc:embedded-database id="dataSource">
<jdbc:script location="classpath:com/bank/config/sql/schema.sql"/>
<jdbc:script location="classpath:com/bank/config/sql/test-data.sql"/>
</jdbc:embedded-database>
</beans>
<beans profile="production">
<jee:jndi-lookup id="dataSource" jndi-name="java:comp/env/jdbc/datasource"/>
</beans>
In the example [1] you see the usage of two profiles called "dev" and "production".
Spring will always load every bean without a profile
Depending on the profiles (yes, you can load multiple profiles at once) all the related beans will be loaded
Loading a profile in Java:
ctx.getEnvironment().setActiveProfiles("dev");
Loading two profiles
ctx.getEnvironment().setActiveProfiles("profile1", "profile2");
Loading from CMD Line declaratively:
-Dspring.profiles.active="profile1,profile2"
Usage in web.xml (can be comma-separated)
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>spring.profiles.active</param-name>
<param-value>production</param-value>
</init-param>
</servlet>
#Comment: If you want to do it using properties and you are able to use newer spring elements, annotations etc. please have a look at this tutorial [2] to make it work with properties file as you commented below.
[1] http://spring.io/blog/2011/02/11/spring-framework-3-1-m1-released/
[2] http://kielczewski.eu/2013/11/setting-active-profile-and-property-sources-in-spring-mvc/
This is almost an add-on to #swinkler's answer.
He gave the first part of the solution which is usage of Spring 3.1+ profiles.
The second part would be to use a kind of automatic registration :
<bean class="java.util.ArrayList" id="serverConfigList"/>
<beans profile="server1">
<bean id="server1Config" class="... />
<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetObject"><ref local="serverConfigList"/></property>
<property name="targetMethod"><value>add</value></property>
<property name="arguments"><ref local="server1Config/></property>
</bean>
</beans>
That way you create an empy list and only add relevant configs to it.
Your code shouldn't change based on environment. If your aim is to use different settings for each environment then load them as properties at start up.
Refer this for 'external configuration'
This can be done in Spring framework 3.1 onwards using a built in Spring environment profiles.
Here's a few resources:
http://java.dzone.com/articles/spring-31-environment-profiles
Hope this helps.

Restlet Framework and Spring - Global filter

I'm having a problem with RESTlet Framework configuration with Spring. I want to have one global filter for all requests and responses. I guess I can use Filter class and it's methods beforeHandle, afterHandle and setNext like this:
Filter.beforeHandle() -> Router -> Filter.afterHandle()
The problem is, that I'm using Spring configured RESTlet and I don't know if the regular Filter will work correctly with SpringRouter from org.restlet.ext.spring package. My current restlet configuration is as follows:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="root" class="org.restlet.ext.spring.SpringRouter">
<property name="attachments">
<map>
<entry key="/login">
<bean class="org.restlet.ext.spring.SpringFinder">
<lookup-method name="create"
bean="loginResource" />
</bean>
</entry>
</map>
</property>
</bean>
</beans>
I'm thinking about adding a bean with id root and class that extends class Filter, and pass to it as property next a bean with id router (which currently is called root). What do you think about this solution?
Mixing Restlet classes from the Spring extension with other one shouldn't be an issue. Spring* classes only provide additional configurability.

Spring MVC annotation error "No adapter for handler - Does your handler implement a supported interface like Controller?"

I have an existing Spring MVC apps written in 2.5.
I wanted to use the new annotation controller. I somewhat see that it is really flexible and would answer my other needs.
My problem is, it seems I cannot mix them both.
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:component-scan
base-package="com.test.web" />
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<!-- Controller Mappings Here -->
<bean id="homeController" class="com.test.web.HomeController">
<property name="cacheSeconds" value="120" />
</bean>
//other plain old spring mvc controller
When I ran my app and hit the home page, I get below error:
javax.servlet.ServletException: No adapter for handler [com.test.web.HomeController#cca07b]: Does your handler implement a supported interface like Controller?
I am not sure but I think something is conflicting. This is a fairly large Spring MVC apps and I don't want to change those modules that were working already using the old Spring Base Controller.
My goal is to only use the annotation controller on my new enhancement.
You don't need to declare DefaultAnnotationHandlerMapping and AnnotationMethodHandlerAdapter. The context has these registered by default, along with adapters for old-style controllers.
When you declare them explicitly like this, the default ones are removed, and the context will only support the ones you declare.

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