Resolve Main Schema URI used for Validation

- currently we pass it in directly without trying to resolve it, which was ok in  3.8.0 because the URI got resolved before we ever got to validation, so we call resolveSchemaLocation on the uriForLoading so that Xerces Validation can use that.
- added tests to verify

DAFFODIL-2950

daffodil-core/src/main/scala/org/apache/daffodil/core/runtime1/SchemaSetRuntime1Mixin.scala

@@ -20,6 +20,7 @@ package org.apache.daffodil.core.runtime1
 import org.apache.daffodil.core.dsom.SchemaSet
 import org.apache.daffodil.core.dsom.SequenceTermBase
 import org.apache.daffodil.lib.util.Logger
+import org.apache.daffodil.lib.xml.XMLUtils
 import org.apache.daffodil.runtime1.api.DFDL
 import org.apache.daffodil.runtime1.layers.LayerRuntimeCompiler
 import org.apache.daffodil.runtime1.layers.LayerRuntimeData
@@ -79,7 +80,14 @@ trait SchemaSetRuntime1Mixin {
       "The root element cannot have the dfdl:outputValueCalc property."
     )
     // stored transiently in the SSRD, only used for full validation
-    val mainSchemaURI = self.schemaSource.uriForLoading
+    val mainSchemaURI =
+      XMLUtils.resolveSchemaLocation(self.schemaSource.uriForLoading.toString, None) match {
+        case Some((uss, _)) => uss.uri
+        case None =>
+          throw new IllegalArgumentException(
+            s"Could not find file or resource ${self.schemaSource.uriForLoading}"
+          )
+      }
     val p = if (!root.isError) parser else null
     val u = if (!root.isError) unparser else null
     val ssrd =

daffodil-japi/src/test/java/org/apache/daffodil/example/TestJavaAPI.java

@@ -27,6 +27,8 @@
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.nio.ByteBuffer;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
@@ -1444,5 +1446,25 @@ public void testJavaAPICompileResource() throws IOException, ClassNotFoundExcept
         }
     }
 
+    @Test
+    public void testJavaAPICompileSource() throws IOException, URISyntaxException, InvalidUsageException {
+        org.apache.daffodil.japi.Compiler c = Daffodil.compiler();
+        URI uri = new URI("/test/japi/mySchema1.dfdl.xsd");
+        ProcessorFactory pf = c.compileSource(uri);
+        DataProcessor dp = pf.onPath("/").withValidationMode(ValidationMode.Full);
+
+        java.io.File file = getResource("/test/japi/myDataBroken.dat");
+        java.io.FileInputStream fis = new java.io.FileInputStream(file);
+        try (InputSourceDataInputStream dis = new InputSourceDataInputStream(fis)) {
+            JDOMInfosetOutputter outputter = new JDOMInfosetOutputter();
+            ParseResult res = dp.parse(dis, outputter);
+            assertTrue(res.isError());
+
+            Diagnostic d = res.getDiagnostics().get(0);
+            LocationInSchemaFile loc = d.getLocationsInSchemaFiles().get(0);
+            assertTrue(loc.toString().replace("\\", "/").contains("in " + uri.getPath()));
+        }
+    }
+
 
 }

daffodil-sapi/src/test/scala/org/apache/daffodil/example/TestScalaAPI.scala

@@ -22,6 +22,7 @@ import java.io.ByteArrayOutputStream
 import java.io.File
 import java.io.ObjectInputStream
 import java.io.ObjectOutputStream
+import java.net.URI
 import java.nio.ByteBuffer
 import java.nio.channels.Channels
 import java.nio.charset.StandardCharsets
@@ -1407,4 +1408,24 @@ class TestScalaAPI {
     }
   }
 
+  @Test
+  def testScalaAPICompileSource(): Unit = {
+    val c = Daffodil.compiler()
+    val uri = new URI("/test/sapi/mySchema1.dfdl.xsd")
+    val pf = c.compileSource(uri)
+    val dp = pf.onPath("/").withValidationMode(ValidationMode.Full)
+
+    val file = getResource("/test/sapi/myDataBroken.dat")
+    val fis = new java.io.FileInputStream(file)
+    using(new InputSourceDataInputStream(fis)) { input =>
+      val outputter = new ScalaXMLInfosetOutputter()
+      val res = dp.parse(input, outputter)
+      assertTrue(res.isError())
+
+      val d = res.getDiagnostics(0)
+      val loc = d.getLocationsInSchemaFiles(0)
+      assertTrue(loc.toString().replace("\\", "/").contains("in " + uri.getPath))
+    }
+  }
+
 }