Apache CXF Simple Frontend Issue: Connection Already Established Error

Frontend
1

I’m working with Apache CXF and trying to set up a web service using the simple frontend approach. I want to expose my Spring service as a web service without adding JAX-WS annotations to keep it clean.

My server setup:

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:simple="http://cxf.apache.org/simple"
xmlns:soap="http://cxf.apache.org/bindings/soap"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:ps="http://example.org/payment/service"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://cxf.apache.org/bindings/soap http://cxf.apache.org/schemas/configuration/soap.xsd
    http://cxf.apache.org/simple http://cxf.apache.org/schemas/simple.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"
    default-autowire="byType">

<import resource="classpath:META-INF/cxf/cxf.xml" />
<import resource="classpath:META-INF/cxf/cxf-extension-soap.xml" />
<import resource="classpath:META-INF/cxf/cxf-extension-http.xml" /> 
<import resource="classpath:META-INF/cxf/cxf-extension-http-binding.xml" /> 
<import resource="classpath:META-INF/cxf/cxf-servlet.xml" />

<import resource="classpath*:applicationContext.xml" /> 

<simple:server id="paymentServer" serviceBean="paymentProcessor"
    serviceClass="com.example.PaymentService"
    bindingId="http://apache.org/cxf/binding/http"
    address="/${service.path}"
    serviceName="ps:paymentProcessor"
    endpointName="ps:paymentProcessorPort">
    <simple:dataBinding>
        <bean class="org.apache.cxf.aegis.databinding.AegisDatabinding" />
    </simple:dataBinding>
    <simple:binding>
        <soap:soapBinding version="1.2" mtomEnabled="true" />
    </simple:binding>
</simple:server>

<context:property-placeholder location="classpath:app.properties" />
</beans>

My client config:

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:simple="http://cxf.apache.org/simple"
xmlns:soap="http://cxf.apache.org/bindings/soap"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:ps="http://example.org/payment/service"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://cxf.apache.org/bindings/soap http://cxf.apache.org/schemas/configuration/soap.xsd
    http://cxf.apache.org/simple http://cxf.apache.org/schemas/simple.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<import resource="classpath:META-INF/cxf/cxf.xml" />
<import resource="classpath:META-INF/cxf/cxf-extension-http.xml" /> 
<import resource="classpath:META-INF/cxf/cxf-extension-http-binding.xml" /> 
<import resource="classpath:META-INF/cxf/cxf-extension-soap.xml" />

<simple:client id="paymentProcessor" wsdlLocation="${service.url}?wsdl"
    serviceName="ps:paymentProcessor"
    endpointName="ps:paymentProcessorPort"
    transportId="http://schemas.xmlsoap.org/soap/http"
    address="${service.url}"
    bindingId="http://apache.org/cxf/binding/http"
    serviceClass="com.example.PaymentService">
    <simple:dataBinding>
        <bean class="org.apache.cxf.aegis.databinding.AegisDatabinding" />
    </simple:dataBinding>
    <simple:binding>
        <soap:soapBinding mtomEnabled="true" version="1.2" />
    </simple:binding>
</simple:client>

<context:property-placeholder location="classpath:app.properties" />
</beans>

When I try to call any method on the service, I get this error:

java.lang.IllegalStateException: Already connected
    at java.net.HttpURLConnection.setFixedLengthStreamingMode(HttpURLConnection.java:103)
    at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.thresholdNotReached(HTTPConduit.java:1889)
    at org.apache.cxf.io.AbstractThresholdOutputStream.close(AbstractThresholdOutputStream.java:99)
    at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1980)
    at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:66)
    at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:639)

This happens right on the first service call. The WSDL loads fine but when I actually invoke a method, I get this connection error. Has anyone seen this before? I’m using the simple frontend because my service doesn’t have JAX-WS annotations and I want to keep it that way.

2

had this exact issue a few months back! you’re mixing http binding with soap binding, which messes up cxf’s connection handling. remove the bindingId="http://apache.org/cxf/binding/http" from both server and client configs - you’re using soap binding anyway. also double-check your service.url property has the right protocol. should be http, not https if you’re testing locally.

3

I encountered a similar problem when configuring Apache CXF with the Simple Frontend. The root cause is likely a conflict between your bindingId set to http://apache.org/cxf/binding/http and the <soap:soapBinding> configuration. This can lead CXF to attempt to establish connections using different protocols, causing the ‘Already connected’ error. To resolve this, try removing the bindingId attribute altogether; this allows the SOAP binding to correctly manage the protocol. Additionally, ensure that the transportId in your client matches the binding in your server configuration to avoid such connection issues.

4

wait, does this error happen on evry method call or just some? what cxf version r u using? i’ve seen different versions handle http/soap binding issues differently. try turning on debug logging - it’ll show u what’s going on with the connection lifecycle.