I am trying to get the basic http rest helloworld example working in Mule but I get this error
Could not find a transformer to transform "SimpleDataType{type=java.lang.String, mimeType='*/*'}" to "SimpleDataType{type=java.io.InputStream, mimeType='*/*'}". (org.mule.api.transformer.TransformerException). Message payload is of type: String
This is my config file:
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:spring="http://www.springframework.org/schema/beans"
xmlns:mulexml="http://www.mulesoft.org/schema/mule/xml" xmlns:jersey="http://www.mulesoft.org/schema/mule/jersey"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/3.3/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/3.3/mule-http.xsd
http://www.mulesoft.org/schema/mule/xml http://www.mulesoft.org/schema/mule/xml/3.3/mule-xml.xsd
http://www.mulesoft.org/schema/mule/jersey http://www.mulesoft.org/schema/mule/jersey/3.0/mule-jersey.xsd
http://jersey.apache.org/core http://jersey.apache.org/schemas/core.xsd">
<flow name="HelloWorld">
<inbound-endpoint address="http://localhost:8081/api"/>
<jersey:resources>
<component class="com.helloworld.AdminApi"/>
</jersey:resources>
</flow>
</mule>
And my jersey service class
@Path("version")
public class AdminApi {
@GET
@Produces("text/plain")
public String sayHelloWithUri() {
return "Version 999 " ;
}
}
I am trying to access the service using:
http://localhost:8081/api/version
which I believe should be the right url but no luck I always get the above exception message.
Anyone has an idea what this could be?
EDIT:
Root Exception stack trace:
org.mule.api.registry.ResolverException: There are two transformers that are an exact match for input: "class java.lang.String", output: "class java.io.InputStream". Transformers are: "_ObjectToInputStream(class org.mule.transformer.simple.ObjectToInputStream)" and "_ObjectToInputStream(class org.mule.transformer.simple.ObjectToInputStream)"
at org.mule.transformer.graph.GraphTransformerResolver.resolve(GraphTransformerResolver.java:65)
at org.mule.registry.TypeBasedTransformerResolver.resolve(TypeBasedTransformerResolver.java:93)
at org.mule.registry.MuleRegistryHelper.resolveTransformer(MuleRegistryHelper.java:265)
+ 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
Your configuration runs just fine with Mule 3.3.0 (tested outside of Tomcat, in Eclipse) so I suspect the problem comes from either missing or duplicated JARs on your web application classpath.
Check the JARs that get packaged in WEB-INF/lib
and potential manually added JARs in Tomcat's /lib
directory.
<flow name="HelloWorld">
<inbound-endpoint address="http://localhost:8081/api"/>
<jersey:resources>
<component class="com.helloworld.AdminApi"/>
</jersey:resources>
</flow>
and use this url. http://localhost:8081/api/version result is -Version 999
If you are running with Mule Studio 3.3.0, you must put the mimeType. Example:
<flow name="RestServiceFlow" doc:name="RestServiceFlow">
<http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8083" doc:name="HTTP" mimeType="application/json"/>
<jersey:resources doc:name="RESTUTCNotification">
<component class="example.esb.restApi"/>
</jersey:resources>
</flow>
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