用于出站连接的SSL配置在websphere liberty 17.0.0.2中不起作用

下面是我的server.xml

<?xml version="1.0" encoding="UTF-8"?>
<server description="Default server">
    <featureManager>
        <feature>appSecurity-2.0</feature>
        <feature>transportSecurity-1.0</feature>
        <feature>jaxrs-2.0</feature>
        <feature>json-1.0</feature>
        <feature>javaMail-1.5</feature>
        <!--<feature>ssl-1.0</feature>-->
    </featureManager>

    <sslDefault sslRef="saasSSLConfig" outboundSSLRef="outboundSSLConfig" />

    <ssl id="saasSSLConfig" keyStoreRef="saasKeyStore" trustStoreRef="saasTrustStore" clientAuthentication="true" sslProtocol="TLSv1" />
    <keyStore id="saasKeyStore" location="/opt/ibm/wlp/output/defaultServer/resources/security/sbs_endpoint_keystore.jks" password="pwd" />
    <keyStore id="saasTrustStore" location="/opt/ibm/wlp/output/defaultServer/resources/security/serverTruststore.jks" password="pwd" />

    <ssl id="outboundSSLConfig" keyStoreRef="defaultKeyStore" trustStoreRef="defaultTrustStore" />

    <basicRegistry id="basic" realm="BasicRealm">
        <!-- <user name="yourUserName" password="" />  -->
    </basicRegistry>

    <httpEndpoint id="defaultHttpEndpoint" host="*" httpPort="9080" httpsPort="9443" />
    <applicationManager autoExpand="true"/>
</server>

服务器版本:

WebSphere Application Server 17.0.0.2 (1.0.17.cl170220170523-1818) on IBM J9 VM, version pxa6480sr4fp7-20170627_02 (SR4 FP7) (en_US)

错误:

[ERROR] CWPKI0022E: SSL HANDSHAKE FAILURE:  A signer with SubjectDN CN=*.api.ibm.com, O=International Business Machines, L=Armonk, ST=New York, C=US was sent from the target host.  The signer might need to be added to local trust store /opt/ibm/wlp/output/defaultServer/resources/security/serverTruststore.jks, located in SSL configuration alias saasSSLConfig.  The extended error message from the SSL handshake exception is: PKIX path building failed: java.security.cert.CertPathBuilderException: PKIXCertPathBuilderImpl could not build a valid CertPath.;
SSLHandshakeException invoking https://dev.api.ibm.com/scx/test/sbs/customer/222222222: java.security.cert.CertificateException: PKIXCertPathBuilderImpl could not build a valid CertPath.