Error while starting prometheus metrics exporter

[BodySplash]

Describe the bug
While using opentelemtry agent, when configured to use prometheus as metrics exporter, it crashed with these error :

ERROR io.opentelemetry.javaagent.OpenTelemetryAgent
java.lang.NoClassDefFoundError: com/sun/net/httpserver/HttpHandler
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Class.java:375)
        at io.opentelemetry.sdk.autoconfigure.ClasspathUtil.checkClassExists(ClasspathUtil.java:15)
        at io.opentelemetry.sdk.autoconfigure.MetricExporterConfiguration.configurePrometheusMetricReader(MetricExporterConfiguration.java:164)
        at io.opentelemetry.sdk.autoconfigure.MetricExporterConfiguration.configureExporter(MetricExporterConfiguration.java:40)
        at io.opentelemetry.sdk.autoconfigure.MeterProviderConfiguration.configureMeterProvider(MeterProviderConfiguration.java:43)
        at io.opentelemetry.sdk.autoconfigure.AutoConfiguredOpenTelemetrySdkBuilder.build(AutoConfiguredOpenTelemetrySdkBuilder.java:313)
        at io.opentelemetry.javaagent.tooling.OpenTelemetryInstaller.installOpenTelemetrySdk(OpenTelemetryInstaller.java:43)
        at io.opentelemetry.javaagent.tooling.AgentInstaller.installBytebuddyAgent(AgentInstaller.java:124)
        at io.opentelemetry.javaagent.tooling.AgentInstaller.installBytebuddyAgent(AgentInstaller.java:95)
        at io.opentelemetry.javaagent.tooling.AgentStarterImpl.start(AgentStarterImpl.java:65)
        at io.opentelemetry.javaagent.bootstrap.AgentInitializer.initialize(AgentInitializer.java:35)
        at io.opentelemetry.javaagent.OpenTelemetryAgent.startAgent(OpenTelemetryAgent.java:55)
        at io.opentelemetry.javaagent.OpenTelemetryAgent.premain(OpenTelemetryAgent.java:44)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:491)
        at java.instrument/sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:503)
Caused by: java.lang.ClassNotFoundException: com.sun.net.httpserver.HttpHandler
        at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
        at io.opentelemetry.javaagent.bootstrap.AgentClassLoader.findClass(AgentClassLoader.java:151)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
        at io.opentelemetry.javaagent.bootstrap.AgentClassLoader.loadClass(AgentClassLoader.java:132)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
        ... 20 more

Steps to reproduce

Run any given java process with the classical agent configuration:

-javaagent:/Users/jb/Downloads/opentelemetry-javaagent-1.11.0.jar \ 
-Dotel.metrics.exporter=prometheus \
-Dotel.traces.exporter=logging \
-Dotel.exporter.prometheus.port=9464

What did you expect to see?
To be able to get metrics through the configured port.

What did you see instead?
The error message, and no http server running

What version are you using?
v1.11.0

Environment
Compiler: "Temurin 17.0.2"
OS: "MacOS 12.1"

Additional context
The issue is not present in agent version 1.10.1
Also, I had a quick look at the current MetricExporterConfiguration.configurePrometheusMetricReader
implementation, and checkClassExists is not called for HttpHandler. So maybe it's just an issue with the version distributed inside the agent ?

[laurit]

Regression from #5169