【发布时间】：2017-05-16 00:26:07
【问题描述】：
我正在试验 WSO2AM 的升级过程，因此我在一台新机器上部署了 1.10.0 版本，创建并发布了一个简单的 API（一种 POST 方法），然后按照here 中描述的升级说明进行操作。
但是，当以给定顺序启动 2.1.0（在链接中，“将 API Manager 升级到 2.1.0”，步骤 4b）时，每次我都会收到以下错误：
[2017-04-02 16:53:33,051] ERROR - ClassMediatorFactory Error loading class : org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler - Class not found
java.lang.ClassNotFoundException: org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler cannot be found by synapse-core_2.1.7.wso2v10
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,056] ERROR - ApiDeployer API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
org.apache.synapse.SynapseException: Error loading class : org.wso2.carbon.apimgt.usage.publisher.APIMgtResponseHandler - Class not found
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,062] ERROR - AbstractSynapseArtifactDeployer Deployment of the Synapse Artifact from file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed!
org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,067] INFO - AbstractSynapseArtifactDeployer The file has been backed up into : NO_BACKUP_ON_WORKER.INFO
[2017-04-02 16:53:33,067] ERROR - AbstractSynapseArtifactDeployer Deployment of synapse artifact failed. Error reading /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
org.apache.axis2.deployment.DeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
<long stack trace here, let me know if it's of any value>
Caused by: org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
<long stack trace here, let me know if it's of any value>
[2017-04-02 16:53:33,083] INFO - DeploymentEngine org.apache.axis2.deployment.DeploymentException: API deployment from the file : /home/gabel/wso2am-2.1.0/repository/deployment/server/synapse-configs/default/api/admin--VPP_REST_v1.0.xml : Failed.
当然，当我按给定顺序执行完所有命令并转到发布者时，称为 VPP_REST 的 API 不存在。我错过了什么？
系统：
- 操作系统：Ubuntu Server 14.04 64 位
- JDK：1.8.0_121
【问题讨论】：