Mulesoft 3.8.1 中的这种选择异常策略有问题吗？
Is there something wrong with this choice exception strategy in Mulesoft 3.8.1?
所以，我是 Mulesoft 的新手，我已经掌握了基础知识 class。
我想我会让我的开发者更容易，并为他们创建一个模板来开始开发。在我进行异常处理之前，一切都很顺利。下面的选择异常策略应该使用一个布尔值，pagerDuty.active，来决定是否POST异常数据到Pager Duty服务。我意识到我的 JSON 正文还不正确，但即便如此我还是无法理解为什么 Web 服务失败并显示 404 并且有效负载已损坏。以下是 global.xml:
中定义的全局元素
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:secure-property-placeholder="http://www.mulesoft.org/schema/mule/secure-property-placeholder"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" xmlns:db="http://www.mulesoft.org/schema/mule/db" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:apikit="http://www.mulesoft.org/schema/mule/apikit" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/secure-property-placeholder http://www.mulesoft.org/schema/mule/secure-property-placeholder/current/mule-secure-property-placeholder.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/db http://www.mulesoft.org/schema/mule/db/current/mule-db.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/apikit http://www.mulesoft.org/schema/mule/apikit/current/mule-apikit.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd">
<context:property-placeholder location="${env}.properties"/>
<http:listener-config name="httpListenerConfig" host="0.0.0.0" port="${http.port}" doc:name="HTTP Listener Configuration"/>
<http:request-config name="HttpConfiguration_GetTheBearerToken" host="${accountTranslation.host}" port="${accountTranslation.port}" basePath="/" doc:name="HttpConfiguration_GetTheBearerToken"/>
<http:request-config name="HttpConfiguration_TranslateAccountNumbers" host="${accountTranslation.host}" port="${accountTranslation.port}" basePath="/api" doc:name="HTTP Request Configuration">
<http:raml-api-configuration location="https://anypoint.mulesoft.com/apiplatform/repository/v2/organizations/95208566-ca0c-48df-8e18-22377534fd5e/public/apis/5521343/versions/103885/files/root"/>
</http:request-config>
<db:generic-config name="ERP_Integration_Database_Connector_Configuration" url="jdbc:sqlserver://${sqlServer.ip}:${sqlServer.port};databaseName=${sqlServer.database};user=${sqlServer.user};password=${sqlServer.password}" driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver" doc:name="Generic Database Configuration"/>
<http:request-config name="HttpRequest_PagerDuty" host="${pagerDuty.host}" port="${pagerDuty.port}" basePath="/" doc:name="HTTP Request Configuration" protocol="HTTPS"/>
</mule>
然后这里是异常策略的定义：
<choice-exception-strategy name="templateChoice_Exception_Strategy">
<catch-exception-strategy when="#[${pagerDuty.active}]"
doc:name="Catch Exception Strategy with Pager Duty">
<set-variable variableName="exceptionPayload"
value="#[groovy:message.getExceptionPayload()]" doc:name="Get the exception payload" />
<choice doc:name="Choice">
<when expression="#[flowVars.exceptionPayload != null]">
<set-variable variableName="message"
value="#[exceptionPayload.getMessage()]" doc:name="Get the message" />
<set-variable variableName="stackTrace"
value="#[exceptionPayload.info.get("Element")]"
doc:name="Get the Stack Trace" />
</when>
<otherwise>
<set-variable variableName="message" value="Unknown exception"
doc:name="Default message" />
<set-variable variableName="stackTrace"
value="The stack trace was not available" doc:name="Default stack trace" />
</otherwise>
</choice>
<set-variable variableName="serviceKey" value="${pagerDuty.serviceKey}" doc:name="Variable"/>
<set-payload
value="#[{"service_key": "flowVars.serviceKey", "event_type": "trigger", "incident_key": "${workflowName}", "description": "#[flowVars.message]", "details": { "Failure Context": "${env}", "Stack Trace": "#[flowVars.stackTrace]" }}] "
mimeType="application/json" doc:name="Set the JSON Body" encoding="US-ASCII" />
<http:request config-ref="HttpRequest_PagerDuty" path="${pagerDuty.basePath}"
method="POST" doc:name="Post to Pager Duty" />
<dw:transform-message metadata:id="0c07879b-66b0-4a52-879b-2635c3c92ed5"
doc:name="Transform Message">
<dw:input-payload />
<dw:set-payload><![CDATA[%dw 1.0
%output application/java
---
{
Status: payload.status,
Message: payload.message,
IncidentKey: payload.incident_key
}
]]></dw:set-payload>
</dw:transform-message>
<choice doc:name="Choice">
<when expression="#[payload.Status == "success"]">
<logger message="Exception logged for #[payload.IncidentKey]"
level="DEBUG" doc:name="Logger" />
</when>
<otherwise>
<logger
message="Failed to log exception Status: #[payload.Status] Message: #[payload.Message] Incident: #[payload.IncidentKey]"
level="ERROR" doc:name="Logger" />
</otherwise>
</choice>
</catch-exception-strategy>
<catch-exception-strategy doc:name="Catch Exception Strategy no Pager Duty"
when="#[${pagerDuty.active} == false]">
<logger
message="Exception: #[groovy:message.getExceptionPayload().getRootException.getMessage()]"
level="ERROR" doc:name="Logger" />
</catch-exception-strategy>
</choice-exception-strategy>
有人能看出这有什么明显的错误吗？我根本无法让它工作，这就是我引发异常来测试它的方式：
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:db="http://www.mulesoft.org/schema/mule/db" xmlns:apikit="http://www.mulesoft.org/schema/mule/apikit" xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw"
xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.mulesoft.org/schema/mule/db http://www.mulesoft.org/schema/mule/db/current/mule-db.xsd
http://www.mulesoft.org/schema/mule/apikit http://www.mulesoft.org/schema/mule/apikit/current/mule-apikit.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd">
<flow name="mainFlow">
<http:listener config-ref="httpListenerConfig" path="/testMe" doc:name="HTTP"/>
<flow-ref name="GetBearerToken" doc:name="GetBearerToken"/>
<db:select config-ref="ERP_Integration_Database_Connector_Configuration" doc:name="Get the accounts to process">
<db:parameterized-query><![CDATA[SELECT DISTINCT
CASE
WHEN DynamicsCompanyNumber = 2 THEN 'TVI'
WHEN DynamicsCompanyNumber = 15 THEN 'SRU'
WHEN DynamicsCompanyNumber = 16 THEN 'SAP'
WHEN DynamicsCompanyNumber = 18 THEN 'VVSP'
WHEN DynamicsCompanyNumber = 21 THEN 'UNIQ'
WHEN DynamicsCompanyNumber = 40 THEN 'UNIC'
WHEN DynamicsCompanyNumber = 42 THEN 'SWMC'
WHEN DynamicsCompanyNumber = 43 THEN 'ADSU'
WHEN DynamicsCompanyNumber = 44 THEN 'ADSC'
END CompanyName
,Acct2, Acct3, Acct4, '' LedgerDimension
FROM dbo.GLTransactions glt WITH (NOLOCK)
INNER JOIN dbo.GLBatch gl WITH (NOLOCK) ON gl.GLBatchID = glt.GLBatchID
UNION
SELECT DISTINCT
CASE
WHEN DynamicsCompanyNumber = 2 THEN 'TVI'
WHEN DynamicsCompanyNumber = 15 THEN 'SRU'
WHEN DynamicsCompanyNumber = 16 THEN 'SAP'
WHEN DynamicsCompanyNumber = 18 THEN 'VVSP'
WHEN DynamicsCompanyNumber = 21 THEN 'UNIQ'
WHEN DynamicsCompanyNumber = 40 THEN 'UNIC'
WHEN DynamicsCompanyNumber = 42 THEN 'SWMC'
WHEN DynamicsCompanyNumber = 43 THEN 'ADSU'
WHEN DynamicsCompanyNumber = 44 THEN 'ADSC'
END CompanyName
,OffsetAcct2, OffsetAcct3, OffsetAcct4, '' LedgerDimension
FROM dbo.GLTransactions glt WITH (NOLOCK)
INNER JOIN dbo.GLBatch gl WITH (NOLOCK) ON gl.GLBatchID = glt.GLBatchID]]></db:parameterized-query>
</db:select>
<set-variable variableName="nullRef" value="#[null]" mimeType="text/plain" doc:name="Set var to null"/>
<expression-component doc:name="induce null ref"><![CDATA[#[flowVars.nullRef[0]] ]]></expression-component>
<flow-ref name="GetTheDistinctAccounts" doc:name="GetTheDistinctAccounts"/>
<logger message="Processed #[sessionVars.accountMap.size()] records and ignored #[sessionVars.accountsNotMapped.size()] records" level="INFO" doc:name="Logger"/>
<set-payload value="#['Not Mapped records:' + sessionVars.accountsNotMapped + 'Mapped records:' + sessionVars.accountMap.values()]" mimeType="text/plain" doc:name="Set Payload"/>
<exception-strategy ref="templateChoice_Exception_Strategy" doc:name="Reference Exception Strategy"/>
</flow>
</mule>
非常感谢任何帮助，坦率地说，Mulesoft 文档非常缺乏这方面的内容！
我认为问题在于这行代码：
<catch-exception-strategy when="#[${pagerDuty.active}]"
您正试图捕获基于布尔值的异常，布尔值的结果不能被视为异常。
只有当您的流程发生异常时，流程才会转移到任何异常策略。如果没有异常则流程的执行不会转移到捕获异常策略。
所以你需要像这样定义你的代码：
<catch-exception-strategy when="#[exception.causedBy("the exception")]" 捕获异常
所以，我是 Mulesoft 的新手，我已经掌握了基础知识 class。
我想我会让我的开发者更容易，并为他们创建一个模板来开始开发。在我进行异常处理之前，一切都很顺利。下面的选择异常策略应该使用一个布尔值，pagerDuty.active，来决定是否POST异常数据到Pager Duty服务。我意识到我的 JSON 正文还不正确，但即便如此我还是无法理解为什么 Web 服务失败并显示 404 并且有效负载已损坏。以下是 global.xml:
中定义的全局元素<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:secure-property-placeholder="http://www.mulesoft.org/schema/mule/secure-property-placeholder"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation" xmlns:spring="http://www.springframework.org/schema/beans" xmlns:db="http://www.mulesoft.org/schema/mule/db" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns:apikit="http://www.mulesoft.org/schema/mule/apikit" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.mulesoft.org/schema/mule/secure-property-placeholder http://www.mulesoft.org/schema/mule/secure-property-placeholder/current/mule-secure-property-placeholder.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/db http://www.mulesoft.org/schema/mule/db/current/mule-db.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/apikit http://www.mulesoft.org/schema/mule/apikit/current/mule-apikit.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd">
<context:property-placeholder location="${env}.properties"/>
<http:listener-config name="httpListenerConfig" host="0.0.0.0" port="${http.port}" doc:name="HTTP Listener Configuration"/>
<http:request-config name="HttpConfiguration_GetTheBearerToken" host="${accountTranslation.host}" port="${accountTranslation.port}" basePath="/" doc:name="HttpConfiguration_GetTheBearerToken"/>
<http:request-config name="HttpConfiguration_TranslateAccountNumbers" host="${accountTranslation.host}" port="${accountTranslation.port}" basePath="/api" doc:name="HTTP Request Configuration">
<http:raml-api-configuration location="https://anypoint.mulesoft.com/apiplatform/repository/v2/organizations/95208566-ca0c-48df-8e18-22377534fd5e/public/apis/5521343/versions/103885/files/root"/>
</http:request-config>
<db:generic-config name="ERP_Integration_Database_Connector_Configuration" url="jdbc:sqlserver://${sqlServer.ip}:${sqlServer.port};databaseName=${sqlServer.database};user=${sqlServer.user};password=${sqlServer.password}" driverClassName="com.microsoft.sqlserver.jdbc.SQLServerDriver" doc:name="Generic Database Configuration"/>
<http:request-config name="HttpRequest_PagerDuty" host="${pagerDuty.host}" port="${pagerDuty.port}" basePath="/" doc:name="HTTP Request Configuration" protocol="HTTPS"/>
</mule>
然后这里是异常策略的定义：
<choice-exception-strategy name="templateChoice_Exception_Strategy">
<catch-exception-strategy when="#[${pagerDuty.active}]"
doc:name="Catch Exception Strategy with Pager Duty">
<set-variable variableName="exceptionPayload"
value="#[groovy:message.getExceptionPayload()]" doc:name="Get the exception payload" />
<choice doc:name="Choice">
<when expression="#[flowVars.exceptionPayload != null]">
<set-variable variableName="message"
value="#[exceptionPayload.getMessage()]" doc:name="Get the message" />
<set-variable variableName="stackTrace"
value="#[exceptionPayload.info.get("Element")]"
doc:name="Get the Stack Trace" />
</when>
<otherwise>
<set-variable variableName="message" value="Unknown exception"
doc:name="Default message" />
<set-variable variableName="stackTrace"
value="The stack trace was not available" doc:name="Default stack trace" />
</otherwise>
</choice>
<set-variable variableName="serviceKey" value="${pagerDuty.serviceKey}" doc:name="Variable"/>
<set-payload
value="#[{"service_key": "flowVars.serviceKey", "event_type": "trigger", "incident_key": "${workflowName}", "description": "#[flowVars.message]", "details": { "Failure Context": "${env}", "Stack Trace": "#[flowVars.stackTrace]" }}] "
mimeType="application/json" doc:name="Set the JSON Body" encoding="US-ASCII" />
<http:request config-ref="HttpRequest_PagerDuty" path="${pagerDuty.basePath}"
method="POST" doc:name="Post to Pager Duty" />
<dw:transform-message metadata:id="0c07879b-66b0-4a52-879b-2635c3c92ed5"
doc:name="Transform Message">
<dw:input-payload />
<dw:set-payload><![CDATA[%dw 1.0
%output application/java
---
{
Status: payload.status,
Message: payload.message,
IncidentKey: payload.incident_key
}
]]></dw:set-payload>
</dw:transform-message>
<choice doc:name="Choice">
<when expression="#[payload.Status == "success"]">
<logger message="Exception logged for #[payload.IncidentKey]"
level="DEBUG" doc:name="Logger" />
</when>
<otherwise>
<logger
message="Failed to log exception Status: #[payload.Status] Message: #[payload.Message] Incident: #[payload.IncidentKey]"
level="ERROR" doc:name="Logger" />
</otherwise>
</choice>
</catch-exception-strategy>
<catch-exception-strategy doc:name="Catch Exception Strategy no Pager Duty"
when="#[${pagerDuty.active} == false]">
<logger
message="Exception: #[groovy:message.getExceptionPayload().getRootException.getMessage()]"
level="ERROR" doc:name="Logger" />
</catch-exception-strategy>
</choice-exception-strategy>
有人能看出这有什么明显的错误吗？我根本无法让它工作，这就是我引发异常来测试它的方式：
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:db="http://www.mulesoft.org/schema/mule/db" xmlns:apikit="http://www.mulesoft.org/schema/mule/apikit" xmlns:dw="http://www.mulesoft.org/schema/mule/ee/dw"
xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.mulesoft.org/schema/mule/ee/dw http://www.mulesoft.org/schema/mule/ee/dw/current/dw.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.mulesoft.org/schema/mule/db http://www.mulesoft.org/schema/mule/db/current/mule-db.xsd
http://www.mulesoft.org/schema/mule/apikit http://www.mulesoft.org/schema/mule/apikit/current/mule-apikit.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd">
<flow name="mainFlow">
<http:listener config-ref="httpListenerConfig" path="/testMe" doc:name="HTTP"/>
<flow-ref name="GetBearerToken" doc:name="GetBearerToken"/>
<db:select config-ref="ERP_Integration_Database_Connector_Configuration" doc:name="Get the accounts to process">
<db:parameterized-query><![CDATA[SELECT DISTINCT
CASE
WHEN DynamicsCompanyNumber = 2 THEN 'TVI'
WHEN DynamicsCompanyNumber = 15 THEN 'SRU'
WHEN DynamicsCompanyNumber = 16 THEN 'SAP'
WHEN DynamicsCompanyNumber = 18 THEN 'VVSP'
WHEN DynamicsCompanyNumber = 21 THEN 'UNIQ'
WHEN DynamicsCompanyNumber = 40 THEN 'UNIC'
WHEN DynamicsCompanyNumber = 42 THEN 'SWMC'
WHEN DynamicsCompanyNumber = 43 THEN 'ADSU'
WHEN DynamicsCompanyNumber = 44 THEN 'ADSC'
END CompanyName
,Acct2, Acct3, Acct4, '' LedgerDimension
FROM dbo.GLTransactions glt WITH (NOLOCK)
INNER JOIN dbo.GLBatch gl WITH (NOLOCK) ON gl.GLBatchID = glt.GLBatchID
UNION
SELECT DISTINCT
CASE
WHEN DynamicsCompanyNumber = 2 THEN 'TVI'
WHEN DynamicsCompanyNumber = 15 THEN 'SRU'
WHEN DynamicsCompanyNumber = 16 THEN 'SAP'
WHEN DynamicsCompanyNumber = 18 THEN 'VVSP'
WHEN DynamicsCompanyNumber = 21 THEN 'UNIQ'
WHEN DynamicsCompanyNumber = 40 THEN 'UNIC'
WHEN DynamicsCompanyNumber = 42 THEN 'SWMC'
WHEN DynamicsCompanyNumber = 43 THEN 'ADSU'
WHEN DynamicsCompanyNumber = 44 THEN 'ADSC'
END CompanyName
,OffsetAcct2, OffsetAcct3, OffsetAcct4, '' LedgerDimension
FROM dbo.GLTransactions glt WITH (NOLOCK)
INNER JOIN dbo.GLBatch gl WITH (NOLOCK) ON gl.GLBatchID = glt.GLBatchID]]></db:parameterized-query>
</db:select>
<set-variable variableName="nullRef" value="#[null]" mimeType="text/plain" doc:name="Set var to null"/>
<expression-component doc:name="induce null ref"><![CDATA[#[flowVars.nullRef[0]] ]]></expression-component>
<flow-ref name="GetTheDistinctAccounts" doc:name="GetTheDistinctAccounts"/>
<logger message="Processed #[sessionVars.accountMap.size()] records and ignored #[sessionVars.accountsNotMapped.size()] records" level="INFO" doc:name="Logger"/>
<set-payload value="#['Not Mapped records:' + sessionVars.accountsNotMapped + 'Mapped records:' + sessionVars.accountMap.values()]" mimeType="text/plain" doc:name="Set Payload"/>
<exception-strategy ref="templateChoice_Exception_Strategy" doc:name="Reference Exception Strategy"/>
</flow>
</mule>
非常感谢任何帮助，坦率地说，Mulesoft 文档非常缺乏这方面的内容！
我认为问题在于这行代码：
<catch-exception-strategy when="#[${pagerDuty.active}]"
您正试图捕获基于布尔值的异常，布尔值的结果不能被视为异常。
只有当您的流程发生异常时，流程才会转移到任何异常策略。如果没有异常则流程的执行不会转移到捕获异常策略。
所以你需要像这样定义你的代码：
<catch-exception-strategy when="#[exception.causedBy("the exception")]" 捕获异常