mbeckerle commented on code in PR #1057:
URL: https://github.com/apache/daffodil/pull/1057#discussion_r1326462641


##########
build.sbt:
##########
@@ -211,6 +214,67 @@ lazy val testStdLayout = 
Project("daffodil-test-stdLayout", file("test-stdLayout
   .dependsOn(tdmlProc % "test")
   .settings(commonSettings, nopublish)
 
+/* Workaround: certain reflection (used by JAXB) isn't allowed by default in 
JDK 17:
+ * 
https://docs.oracle.com/en/java/javase/17/migrate/migrating-jdk-8-later-jdk-releases.html#GUID-7BB28E4D-99B3-4078-BDC4-FC24180CE82B
+ *
+ * While we can handle this JVM quirk at build time, at runtime we won't know
+ * a user's JVM version. We'll provide documentation and an extension setting
+ * to add these flags to the extension-launched debugger backend.
+ */
+lazy val extraJvmOptions: Seq[String] =
+  if (scala.util.Properties.isJavaAtLeast("17"))
+    Seq(
+      "--add-opens",
+      "java.base/java.lang=ALL-UNNAMED",
+    )
+  else Seq()
+
+lazy val xjcSettings =
+  Seq(
+    libraryDependencies ++= Seq(
+      "com.sun.xml.bind" % "jaxb-impl" % "2.2.11",
+      "javax.activation" % "activation" % "1.1.1",
+      "org.glassfish.jaxb" % "jaxb-xjc" % "2.2.11",
+    ),
+    xjcCommandLine += "-nv",
+    xjcCommandLine += "-p",
+    xjcCommandLine += "org.apache.daffodil.tdml",
+    xjcBindings += "daffodil-tdml-lib/src/main/resources/bindings.xjb",
+    xjcLibs := Seq(
+      "org.glassfish.jaxb" % "jaxb-xjc" % "2.2.11",
+      "com.sun.xml.bind" % "jaxb-impl" % "2.2.11",
+      "javax.activation" % "activation" % "1.1.1",
+    ),
+    xjcJvmOpts ++= extraJvmOptions,
+    Compile / xjc / sources := Seq(
+      // Need to refer to the individual files because we do not want 
XMLSchema to go through the JAXB compliation

Review Comment:
   I think you should only need to generate objects for:
   
   tdml.xsd
   
   The challenge is that some TDML files embed mini-schemas inside using 
tdml:defineSchema. 
   
   That can hold anything one would find inside a DFDL schema, so.... not sure 
how to cope with that without dragging all of XMLSchema_for_DFDL.xsd 
   
   These other schema files should not be needed nor used:
   
   dafint.xsd
   dafext.xsd
   dfdlx.xsd
   datatypes.dtd
   xml.xsd
   XMLSchema.dtd
   XMLSchema.xsd
   
   And hopefully not these depending on the tdml:defineSchema issue:
   
   XMLSchema_for_DFDL.xsd
   DFDL_part?_*.xsd - 3 files match this (used by XMLSchema_for_DFDL.xsd)
   



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