Remove struts2 latest dep restriction (#5289)

instrumentation/struts-2.3/javaagent/build.gradle.kts

@@ -15,12 +15,6 @@ dependencies {
 
   library("org.apache.struts:struts2-core:2.3.1")
 
-  // There was no 2.4 version at all.
-  // In version 2.5 Struts Servlet Filter entry point was relocated.
-  // This Servlet Filter is relevant only in setting up the test app and it is not used in
-  // instrumentation. So fixing Struts library version for the test.
-  latestDepTestLibrary("org.apache.struts:struts2-core:2.3.+")
-
   testImplementation(project(":testing-common"))
   testImplementation("org.eclipse.jetty:jetty-server:8.0.0.v20110901")
   testImplementation("org.eclipse.jetty:jetty-servlet:8.0.0.v20110901")

instrumentation/struts-2.3/javaagent/src/test/groovy/Struts2ActionSpanTest.groovy

@@ -12,7 +12,6 @@ import io.opentelemetry.instrumentation.test.base.HttpServerTest
 import io.opentelemetry.sdk.trace.data.SpanData
 import io.opentelemetry.semconv.trace.attributes.SemanticAttributes
 import io.opentelemetry.struts.GreetingServlet
-import org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
 import org.eclipse.jetty.server.Server
 import org.eclipse.jetty.servlet.DefaultServlet
 import org.eclipse.jetty.servlet.ServletContextHandler
@@ -116,7 +115,15 @@ class Struts2ActionSpanTest extends HttpServerTest<Server> implements AgentTestT
 
     context.addServlet(DefaultServlet, "/")
     context.addServlet(GreetingServlet, "/greetingServlet")
-    context.addFilter(StrutsPrepareAndExecuteFilter, "/*", EnumSet.of(DispatcherType.REQUEST))
+    def strutsFilterClass = null
+    try {
+      // struts 2.3
+      strutsFilterClass = Class.forName("org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter")
+    } catch (ClassNotFoundException exception) {
+      // struts 2.5
+      strutsFilterClass = Class.forName("org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter")
+    }
+    context.addFilter(strutsFilterClass, "/*", EnumSet.of(DispatcherType.REQUEST))
 
     server.start()
 

instrumentation/struts-2.3/javaagent/src/test/resources/struts.xml

@@ -7,6 +7,7 @@
 
   <constant name="struts.enable.SlashesInActionNames" value="true"/>
   <constant name="struts.patternMatcher" value="namedVariable"/>
+  <constant name="struts.matcher.appendNamedParameters" value="true"/>
 
   <package name="basic-struts2" extends="struts-default">
     <global-results>