agent causes failure of Spring application

從 HttpTraceDisabler.java 開始，特別查看 findServletContextHandler、disableTrace 和 customize，然後結合啟動堆疊追蹤檢視 cmd.txt 和 appmap.log。重現 AqueductService 的啟動失敗，並判斷是什麼讓 Spring 應用程式能夠在沒有 ServletContextHandler 例外的情況下啟動。

Exception on startup:

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is java.lang.IllegalStateException: Cannot find instance of ServletContextHandler
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:165)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:732)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:409)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
        at com.salesforce.sconems.abstractions.SconeApp.run(SconeApp.java:122)
        at com.salesforce.sconems.abstractions.SconeApp.run(SconeApp.java:167)
        at com.salesforce.aqueduct.AqueductService.main(AqueductService.java:19)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:65)
java.lang.IllegalStateException: Cannot find instance of ServletContextHandler
        at com.salesforce.sconems.jetty.HttpTraceDisabler.findServletContextHandler(HttpTraceDisabler.java:61)
        at com.salesforce.sconems.jetty.HttpTraceDisabler.disableTrace(HttpTraceDisabler.java:46)
        at com.salesforce.sconems.jetty.HttpTraceDisabler.customize(HttpTraceDisabler.java:41)
        at org.springframework.boot.web.embedded.jetty.JettyServletWebServerFactory.getWebServer(JettyServletWebServerFactory.java:171)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:184)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:732)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:409)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)
        at com.salesforce.sconems.abstractions.SconeApp.run(SconeApp.java:122)
        at com.salesforce.sconems.abstractions.SconeApp.run(SconeApp.java:167)
        at com.salesforce.aqueduct.AqueductService.main(AqueductService.java:19)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:65)

java command line: cmd.txt
agent log: appmap.log
Disabling remote recording and request recording didn't alter startup behavior.