Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource]

**tchize_** · 22/10/2010, 16h32

Bonjour,

débutant en spring, j'ai un soucis pour faire ma configuration.

Mes xml sont comme ceci:

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<?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"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
 
 
    <util:properties id="config">
      <prop key="statusDb.driver">org.h2.Driver</prop>
      <prop key="statusDb.url">jdbc:h2:mem:test;DB_CLOSE_DELAY=-1</prop>
      <prop key="statusDb.user">sa</prop>
      <prop key="statusDb.password">sa</prop>
    </util:properties>
 
    <context:property-placeholder properties-ref="config"/>
</beans>

et ceci

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<?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"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
 
 
    <bean id="persistentDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName"><value>${statusDb.driver}</value></property>
        <property name="url"><value>${statusDb.url}</value></property>
        <property name="username"><value>${statusDb.user}</value></property>
        <property name="password"><value>${statusDb.password}</value></property>
    </bean>
    <bean id="DbLogging" name="LogStatusAppender"
        class="xxx.ProductStatusAppender">
        <property name="datasource">
          <idref local="persistentDataSource"/>
        </property>
        </bean>
</beans>

Lorsque je charge ce context avec spring 3, j'ai cette erreur:
Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource]

console:

Code :

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2010-10-22 16:29:17 ClassPathXmlApplicationContext [INFO] Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@3d358f03: startup date [Fri Oct 22 16:29:17 CEST 2010]; root of context hierarchy
2010-10-22 16:29:17 XmlBeanDefinitionReader [INFO] Loading XML bean definitions from class path resource [contexts/testNg-database.xml]
2010-10-22 16:29:17 DefaultDocumentLoader [DEBUG] Using JAXP provider [com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl]
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Loading schema mappings from [META-INF/spring.schemas]
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Loaded schema mappings: {http://www.springframework.org/schema/lang/spring-lang.xsd=org/springframework/scripting/config/spring-lang-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang-2.5.xsd=org/springframework/scripting/config/spring-lang-2.5.xsd, http://www.springframework.org/schema/context/spring-context-2.5.xsd=org/springframework/context/config/spring-context-2.5.xsd, http://www.springframework.org/schema/aop/spring-aop.xsd=org/springframework/aop/config/spring-aop-3.0.xsd, http://www.springframework.org/schema/context/spring-context.xsd=org/springframework/context/config/spring-context-3.0.xsd, http://www.springframework.org/schema/util/spring-util-3.0.xsd=org/springframework/beans/factory/xml/spring-util-3.0.xsd, http://www.springframework.org/schema/util/spring-util-2.0.xsd=org/springframework/beans/factory/xml/spring-util-2.0.xsd, http://www.springframework.org/schema/task/spring-task-3.0.xsd=org/springframework/scheduling/config/spring-task-3.0.xsd, http://www.springframework.org/schema/util/spring-util-2.5.xsd=org/springframework/beans/factory/xml/spring-util-2.5.xsd, http://www.springframework.org/schema/tool/spring-tool-3.0.xsd=org/springframework/beans/factory/xml/spring-tool-3.0.xsd, http://www.springframework.org/schema/tool/spring-tool-2.0.xsd=org/springframework/beans/factory/xml/spring-tool-2.0.xsd, http://www.springframework.org/schema/task/spring-task.xsd=org/springframework/scheduling/config/spring-task-3.0.xsd, http://www.springframework.org/schema/context/spring-context-3.0.xsd=org/springframework/context/config/spring-context-3.0.xsd, http://www.springframework.org/schema/beans/spring-beans-2.0.xsd=org/springframework/beans/factory/xml/spring-beans-2.0.xsd, http://www.springframework.org/schema/tool/spring-tool-2.5.xsd=org/springframework/beans/factory/xml/spring-tool-2.5.xsd, http://www.springframework.org/schema/jee/spring-jee.xsd=org/springframework/ejb/config/spring-jee-3.0.xsd, http://www.springframework.org/schema/beans/spring-beans-2.5.xsd=org/springframework/beans/factory/xml/spring-beans-2.5.xsd, http://www.springframework.org/schema/beans/spring-beans.xsd=org/springframework/beans/factory/xml/spring-beans-3.0.xsd, http://www.springframework.org/schema/tool/spring-tool.xsd=org/springframework/beans/factory/xml/spring-tool-3.0.xsd, http://www.springframework.org/schema/aop/spring-aop-3.0.xsd=org/springframework/aop/config/spring-aop-3.0.xsd, http://www.springframework.org/schema/jee/spring-jee-3.0.xsd=org/springframework/ejb/config/spring-jee-3.0.xsd, http://www.springframework.org/schema/aop/spring-aop-2.0.xsd=org/springframework/aop/config/spring-aop-2.0.xsd, http://www.springframework.org/schema/jee/spring-jee-2.0.xsd=org/springframework/ejb/config/spring-jee-2.0.xsd, http://www.springframework.org/schema/aop/spring-aop-2.5.xsd=org/springframework/aop/config/spring-aop-2.5.xsd, http://www.springframework.org/schema/jee/spring-jee-2.5.xsd=org/springframework/ejb/config/spring-jee-2.5.xsd, http://www.springframework.org/schema/beans/spring-beans-3.0.xsd=org/springframework/beans/factory/xml/spring-beans-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang-3.0.xsd=org/springframework/scripting/config/spring-lang-3.0.xsd, http://www.springframework.org/schema/lang/spring-lang-2.0.xsd=org/springframework/scripting/config/spring-lang-2.0.xsd, http://www.springframework.org/schema/util/spring-util.xsd=org/springframework/beans/factory/xml/spring-util-3.0.xsd}
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Found XML schema [http://www.springframework.org/schema/beans/spring-beans-3.0.xsd] in classpath: org/springframework/beans/factory/xml/spring-beans-3.0.xsd
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Found XML schema [http://www.springframework.org/schema/util/spring-util-3.0.xsd] in classpath: org/springframework/beans/factory/xml/spring-util-3.0.xsd
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Found XML schema [http://www.springframework.org/schema/tool/spring-tool-3.0.xsd] in classpath: org/springframework/beans/factory/xml/spring-tool-3.0.xsd
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Found XML schema [http://www.springframework.org/schema/context/spring-context-3.0.xsd] in classpath: org/springframework/context/config/spring-context-3.0.xsd
2010-10-22 16:29:18 DefaultBeanDefinitionDocumentReader [DEBUG] Loading bean definitions
2010-10-22 16:29:18 DefaultNamespaceHandlerResolver [DEBUG] Loaded NamespaceHandler mappings: {http://www.springframework.org/schema/p=org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler, http://www.springframework.org/schema/lang=org.springframework.scripting.config.LangNamespaceHandler, http://www.springframework.org/schema/jee=org.springframework.ejb.config.JeeNamespaceHandler, http://www.springframework.org/schema/aop=org.springframework.aop.config.AopNamespaceHandler, http://www.springframework.org/schema/util=org.springframework.beans.factory.xml.UtilNamespaceHandler, http://www.springframework.org/schema/task=org.springframework.scheduling.config.TaskNamespaceHandler, http://www.springframework.org/schema/context=org.springframework.context.config.ContextNamespaceHandler}
2010-10-22 16:29:18 XmlBeanDefinitionReader [DEBUG] Loaded 2 bean definitions from location pattern [/contexts/testNg-database.xml]
2010-10-22 16:29:18 XmlBeanDefinitionReader [INFO] Loading XML bean definitions from class path resource [beans-config.xml]
2010-10-22 16:29:18 DefaultDocumentLoader [DEBUG] Using JAXP provider [com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl]
2010-10-22 16:29:18 PluggableSchemaResolver [DEBUG] Found XML schema [http://www.springframework.org/schema/beans/spring-beans-3.0.xsd] in classpath: org/springframework/beans/factory/xml/spring-beans-3.0.xsd
2010-10-22 16:29:18 DefaultBeanDefinitionDocumentReader [DEBUG] Loading bean definitions
2010-10-22 16:29:18 XmlBeanDefinitionReader [DEBUG] Loaded 3 bean definitions from location pattern [/beans-config.xml]
2010-10-22 16:29:18 ClassPathXmlApplicationContext [DEBUG] Bean factory for org.springframework.context.support.ClassPathXmlApplicationContext@3d358f03: org.springframework.beans.factory.support.DefaultListableBeanFactory@1b45e2d5: defining beans [config,org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,persistentDataSource,DbLogging,main]; root of factory hierarchy
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating shared instance of singleton bean 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating instance of bean 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Eagerly caching bean 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0' to allow for resolving potential circular references
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating shared instance of singleton bean 'config'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating instance of bean 'config'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Eagerly caching bean 'config' to allow for resolving potential circular references
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Invoking afterPropertiesSet() on bean with name 'config'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Finished creating instance of bean 'config'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Finished creating instance of bean 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0'
2010-10-22 16:29:18 ClassPathXmlApplicationContext [DEBUG] Unable to locate MessageSource with name 'messageSource': using default [org.springframework.context.support.DelegatingMessageSource@293bdd36]
2010-10-22 16:29:18 ClassPathXmlApplicationContext [DEBUG] Unable to locate ApplicationEventMulticaster with name 'applicationEventMulticaster': using default [org.springframework.context.event.SimpleApplicationEventMulticaster@51701bdc]
2010-10-22 16:29:18 DefaultListableBeanFactory [INFO] Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1b45e2d5: defining beans [config,org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,persistentDataSource,DbLogging,main]; root of factory hierarchy
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Returning cached instance of singleton bean 'config'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Returning cached instance of singleton bean 'org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating shared instance of singleton bean 'persistentDataSource'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating instance of bean 'persistentDataSource'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Eagerly caching bean 'persistentDataSource' to allow for resolving potential circular references
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Finished creating instance of bean 'persistentDataSource'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating shared instance of singleton bean 'DbLogging'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Creating instance of bean 'DbLogging'
2010-10-22 16:29:18 DefaultListableBeanFactory [DEBUG] Eagerly caching bean 'DbLogging' to allow for resolving potential circular references
2010-10-22 16:29:18 BeanUtils [DEBUG] No property editor [javax.sql.DataSourceEditor] found for type javax.sql.DataSource according to 'Editor' suffix convention
2010-10-22 16:29:18 DefaultListableBeanFactory [INFO] Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1b45e2d5: defining beans [config,org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#0,persistentDataSource,DbLogging,main]; root of factory hierarchy
2010-10-22 16:29:18 DisposableBeanAdapter [DEBUG] Invoking destroy method 'close' on bean with name 'persistentDataSource'
FAILED CONFIGURATION: @BeforeTest init
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'DbLogging' defined in class path resource [beans-config.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'javax.sql.DataSource' for property 'datasource'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for property 'datasource': no matching editors or conversion strategy found
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)
    at be.meteo.products.sender.logging.ProductStatusAppenderTest.init(ProductStatusAppenderTest.java:38)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:73)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:516)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:196)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:126)
    at org.testng.TestRunner.beforeRun(TestRunner.java:620)
    at org.testng.TestRunner.run(TestRunner.java:588)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:315)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:310)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:272)
    at org.testng.SuiteRunner.run(SuiteRunner.java:221)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:946)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:883)
    at org.testng.TestNG.run(TestNG.java:814)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:89)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:144)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'javax.sql.DataSource' for property 'datasource'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] for property 'datasource': no matching editors or conversion strategy found
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:462)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:499)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:493)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1371)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1330)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1086)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    ... 32 more

Si je commente le bean foireux (DbLogging), j'arrive à récupérer dans le contexte la datasource et elle implémente bien javax.sql.DataSource

Voici la section relevant de mon bean de logging

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    public DataSource getDatasource() {
        return datasource;
    }
 
 
    public void setDatasource(DataSource datasource) {
        this.datasource = datasource;
    }

J'ignore ou spring va trouver que c'est une "String". Et comme il ne l'affiche pas, je n'ai pas la moindre idée de ce qu'il a été dégotter :/

**fr1man** · 22/10/2010, 18h28

Essaie plutôt avec une ref :

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<bean id="DbLogging" name="LogStatusAppender"
        class="xxx.ProductStatusAppender">
        <property name="datasource" ref="persistentDataSource"/>
        </bean>

Avec ton idref, c'est le nom persistentDataSource qui est passé en String et pas le bean lui même.

**tchize_** · 22/10/2010, 20h42

effectivement

mais d'après la doc, idref permet aussi de pointer un bean, tout ça est encore obscur pour moi.

**al3alwa** · 26/10/2010, 09h15

Bonjour,
En fait le idref permet de passer l'id d'un bean à un autre ainsi ce code

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<property name="datasource">
          <idref local="persistentDataSource"/>
        </property>

est equivalent à:

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<property name="datasource" value="persistentDataSource"/>

la première écriture est meilleur car spring verifiera au déploiment que le bean dont l'id est idref existe.

**Patriarch24** · 26/10/2010, 09h55

Tu voulais sans doute écrire :

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<property name="datasource" ref="persistentDataSource"/>

Et Spring vérifie aussi la présence de ce bean. Outre le fait que c'est plus court, c'est la méthode utilisée partout dans la doc de Spring.

Personnellement, je préfère écrire le xml sous cette forme :

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<?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"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
 
 
    <bean id="persistentDataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close"
        p:driverClassName="${statusDb.driver}" p:url="${statusDb.url}" p:username="${statusDb.user}" p:password="${statusDb.password}" />
    </bean>
    <bean id="DbLogging" name="LogStatusAppender"
        class="xxx.ProductStatusAppender" p:datasource-ref="persistentDataSource"/>
</beans>

**tchize_** · 26/10/2010, 11h13

donc si j'ai bien compris, idref permet de passer le nom d'un bean (une string donc) en vérifiant que ce bean existe bien. En pratique, quel usage mon application aurait à connaitre le nom d'un bean?

**Patriarch24** · 26/10/2010, 14h42

La référence ici.

**tchize_** · 26/10/2010, 18h31

merci, j'ai du mal lire en avalant la doc

Cannot convert value of type [java.lang.String] to required type [javax.sql.DataSource] [Framework]

Spring Java

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