为什么在 WSO2 ESB 中我不能创建两个具有相同上下文值的不同 API？

【问题标题】：Why in WSO2 ESB I can't create two different APIs having the same context value?为什么在 WSO2 ESB 中我不能创建两个具有相同上下文值的不同 API？
【发布时间】：2018-04-18 14:20:13
【问题描述】：

我不是很喜欢 WSO2 ESB，我有以下问题。

在我的 ESB 项目中，我有 2 个不同的 API，它们具有相同的上下文，但处理不同的 URL。

1) 第一个名为CommoditiesInACountry，它是这样定义的：

<?xml version="1.0" encoding="UTF-8"?>
<api context="/country" name="CommoditiesInACountry" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="GET" uri-template="/{localizationId}/commodities">
    ..............................................................
    ..............................................................
    ..............................................................

2) 第二个被命名为CommodityInLocationMarkets，它是这样定义的：

<?xml version="1.0" encoding="UTF-8"?>
<api context="/country" name="CommodityInLocationMarkets" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="GET" uri-template="/{localizationId}/commodity/{commodityId}">
    ..............................................................
    ..............................................................
    ..............................................................

如您所见，两者具有相同的上下文，具有值 /country，但 2 个 API 处理不同的 URL，实际上第一个处理资源 .../country/{ localizationId}/commodities 和第二个处理资源 .../country/{localizationId}/commodity/{commodityId}

问题是，当我部署我的 Carbon 应用程序时，我收到以下错误消息，这与我有 2 个具有相同上下文值的不同 API 相关：

TID: [-1234] [] [2017-12-01 15:37:31,573]  INFO {org.apache.synapse.rest.API} -  Initializing API: CommodityInLocationMarkets {org.apache.synapse.rest.API}
TID: [-1234] [] [2017-12-01 15:37:31,573] ERROR {org.apache.synapse.config.SynapseConfiguration} -  URL context: /country is already registered with the API: CommoditiesInACountry {org.apache.synapse.config.SynapseConfiguration}
TID: [-1234] [] [2017-12-01 15:37:31,573] ERROR {org.wso2.carbon.rest.api.ApiDeployer} -  API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed. {org.wso2.carbon.rest.api.ApiDeployer}
org.apache.synapse.SynapseException: URL context: /country is already registered with the API: CommoditiesInACountry
        at org.apache.synapse.config.SynapseConfiguration.handleException(SynapseConfiguration.java:1629)
        at org.apache.synapse.config.SynapseConfiguration.addAPI(SynapseConfiguration.java:407)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:59)
        at org.wso2.carbon.rest.api.ApiDeployer.deploySynapseArtifact(ApiDeployer.java:34)
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:194)
        at org.wso2.carbon.application.deployer.synapse.SynapseAppDeployer.deployArtifacts(SynapseAppDeployer.java:131)
        at org.wso2.carbon.application.deployer.internal.ApplicationManager.deployCarbonApp(ApplicationManager.java:272)
        at org.wso2.carbon.application.deployer.CappAxis2Deployer.deploy(CappAxis2Deployer.java:72)
        at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
        at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:807)
        at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
        at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
        at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
        at org.apache.axis2.deployment.RepositoryListener.startListener(RepositoryListener.java:371)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.checkRepository(SchedulerTask.java:59)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.run(SchedulerTask.java:67)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.runAxisDeployment(CarbonDeploymentSchedulerTask.java:93)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.run(CarbonDeploymentSchedulerTask.java:138)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
TID: [-1234] [] [2017-12-01 15:37:31,574] ERROR {org.apache.synapse.deployers.AbstractSynapseArtifactDeployer} -  Deployment of the Synapse Artifact from file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed! {org.apache.synapse.deployers.AbstractSynapseArtifactDeployer}
org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed.
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.handleSynapseArtifactDeploymentError(AbstractSynapseArtifactDeployer.java:474)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:71)
        at org.wso2.carbon.rest.api.ApiDeployer.deploySynapseArtifact(ApiDeployer.java:34)
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:194)
        at org.wso2.carbon.application.deployer.synapse.SynapseAppDeployer.deployArtifacts(SynapseAppDeployer.java:131)
        at org.wso2.carbon.application.deployer.internal.ApplicationManager.deployCarbonApp(ApplicationManager.java:272)
        at org.wso2.carbon.application.deployer.CappAxis2Deployer.deploy(CappAxis2Deployer.java:72)
        at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
        at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:807)
        at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
        at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
        at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
        at org.apache.axis2.deployment.RepositoryListener.startListener(RepositoryListener.java:371)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.checkRepository(SchedulerTask.java:59)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.run(SchedulerTask.java:67)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.runAxisDeployment(CarbonDeploymentSchedulerTask.java:93)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.run(CarbonDeploymentSchedulerTask.java:138)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.synapse.SynapseException: URL context: /country is already registered with the API: CommoditiesInACountry
        at org.apache.synapse.config.SynapseConfiguration.handleException(SynapseConfiguration.java:1629)
        at org.apache.synapse.config.SynapseConfiguration.addAPI(SynapseConfiguration.java:407)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:59)
        ... 22 more
TID: [-1234] [] [2017-12-01 15:37:31,576]  INFO {org.apache.synapse.deployers.AbstractSynapseArtifactDeployer} -  The file has been backed up into : NO_BACKUP_ON_WORKER.INFO {org.apache.synapse.deployers.AbstractSynapseArtifactDeployer}
TID: [-1234] [] [2017-12-01 15:37:31,576] ERROR {org.apache.synapse.deployers.AbstractSynapseArtifactDeployer} -  Deployment of synapse artifact failed. Error reading /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed. {org.apache.synapse.deployers.AbstractSynapseArtifactDeployer}
org.apache.axis2.deployment.DeploymentException: API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed.
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:201)
        at org.wso2.carbon.application.deployer.synapse.SynapseAppDeployer.deployArtifacts(SynapseAppDeployer.java:131)
        at org.wso2.carbon.application.deployer.internal.ApplicationManager.deployCarbonApp(ApplicationManager.java:272)
        at org.wso2.carbon.application.deployer.CappAxis2Deployer.deploy(CappAxis2Deployer.java:72)
        at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
        at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:807)
        at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
        at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
        at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
        at org.apache.axis2.deployment.RepositoryListener.startListener(RepositoryListener.java:371)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.checkRepository(SchedulerTask.java:59)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.run(SchedulerTask.java:67)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.runAxisDeployment(CarbonDeploymentSchedulerTask.java:93)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.run(CarbonDeploymentSchedulerTask.java:138)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed.
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.handleSynapseArtifactDeploymentError(AbstractSynapseArtifactDeployer.java:474)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:71)
        at org.wso2.carbon.rest.api.ApiDeployer.deploySynapseArtifact(ApiDeployer.java:34)
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:194)
        ... 20 more
Caused by: org.apache.synapse.SynapseException: URL context: /country is already registered with the API: CommoditiesInACountry
        at org.apache.synapse.config.SynapseConfiguration.handleException(SynapseConfiguration.java:1629)
        at org.apache.synapse.config.SynapseConfiguration.addAPI(SynapseConfiguration.java:407)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:59)
        ... 22 more
TID: [-1234] [] [2017-12-01 15:37:31,577] ERROR {org.wso2.carbon.application.deployer.internal.ApplicationManager} -  Error occurred while deploying Carbon Application {org.wso2.carbon.application.deployer.internal.ApplicationManager}
org.apache.axis2.deployment.DeploymentException: API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed.
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:213)
        at org.wso2.carbon.application.deployer.synapse.SynapseAppDeployer.deployArtifacts(SynapseAppDeployer.java:131)
        at org.wso2.carbon.application.deployer.internal.ApplicationManager.deployCarbonApp(ApplicationManager.java:272)
        at org.wso2.carbon.application.deployer.CappAxis2Deployer.deploy(CappAxis2Deployer.java:72)
        at org.apache.axis2.deployment.repository.util.DeploymentFileData.deploy(DeploymentFileData.java:136)
        at org.apache.axis2.deployment.DeploymentEngine.doDeploy(DeploymentEngine.java:807)
        at org.apache.axis2.deployment.repository.util.WSInfoList.update(WSInfoList.java:144)
        at org.apache.axis2.deployment.RepositoryListener.update(RepositoryListener.java:377)
        at org.apache.axis2.deployment.RepositoryListener.checkServices(RepositoryListener.java:254)
        at org.apache.axis2.deployment.RepositoryListener.startListener(RepositoryListener.java:371)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.checkRepository(SchedulerTask.java:59)
        at org.apache.axis2.deployment.scheduler.SchedulerTask.run(SchedulerTask.java:67)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.runAxisDeployment(CarbonDeploymentSchedulerTask.java:93)
        at org.wso2.carbon.core.deployment.CarbonDeploymentSchedulerTask.run(CarbonDeploymentSchedulerTask.java:138)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.axis2.deployment.DeploymentException: API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed.
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:201)
        ... 20 more
Caused by: org.apache.synapse.deployers.SynapseArtifactDeploymentException: API deployment from the file : /opt/wso2/wso2ei-6.1.1/wso2/tmp/carbonapps/-1234/1512139051333agrimarketprice-cap_1.0.0.car/CommodityInLocationMarkets_1.0.0/CommodityInLocationMarkets-1.0.0.xml : Failed.
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.handleSynapseArtifactDeploymentError(AbstractSynapseArtifactDeployer.java:474)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:71)
        at org.wso2.carbon.rest.api.ApiDeployer.deploySynapseArtifact(ApiDeployer.java:34)
        at org.apache.synapse.deployers.AbstractSynapseArtifactDeployer.deploy(AbstractSynapseArtifactDeployer.java:194)
        ... 20 more
Caused by: org.apache.synapse.SynapseException: URL context: /country is already registered with the API: CommoditiesInACountry
        at org.apache.synapse.config.SynapseConfiguration.handleException(SynapseConfiguration.java:1629)
        at org.apache.synapse.config.SynapseConfiguration.addAPI(SynapseConfiguration.java:407)
        at org.apache.synapse.deployers.APIDeployer.deploySynapseArtifact(APIDeployer.java:59)

更改正确部署在我的 Carbon 服务器上的 2 个 API 上下文值之一。

我的问题是我需要这两个 API 的 URL 都以由上下文值定义的 .../country 开头。

WSO2 ESB 怎么可能不允许两个 API 使用相同的上下文？如何创建两个不同的 API，它们的 URL 如下：XXX.YYY.ZZZ.RRR/country/...

是否可以使用WSO2 ESB？

一个可能的解决方案（如果有错误请纠正我）可能是我的 API 有两种不同的内容，然后将其映射到 WSO2 API MANAGER 中，在此处定义最终用户使用的最终 URL。

有什么解决办法？

【问题讨论】：

  • ESB/APIM 不允许创建 2 个具有相同上下文的 API。是否有任何特定原因需要 2 个具有相同上下文的 API，而只有一个具有多个资源？

标签： wso2 wso2esb esb


【解决方案1】：

ESB/APIM 不允许创建 2 个具有相同上下文的 API。但是，您可以使用一个 API 并拥有多个这样的资源。

<?xml version="1.0" encoding="UTF-8"?>
<api context="/country" name="CommoditiesInACountry" xmlns="http://ws.apache.org/ns/synapse">
    <resource methods="GET" uri-template="/{localizationId}/commodities">
        ................................
        ................................
    </resource>
    <resource methods="GET" uri-template="/{localizationId}/commodity/{commodityId}">
        ................................
        ................................
    </resource>
</api>

相关说明：要遵守 REST 标准，您的第二个资源应该是 /{localizationId}/commodities/{commodityId}

【讨论】：

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