flatten modules to repo root, vendor deps, repair Eclipse build paths

Move api, engine, ui-console and ui-desktop out of modules/ up to the
repo root and drop the empty exception project (GuessMarketException now
lives in api).

Vendor gson, jaxb, okhttp, openjfx and tomcat under lib/, and group the
JUnit standalone jar into lib/junit/ alongside them.

Rewrite every .classpath: drop the copy-pasted optional="true" that was
masking real build path errors, point the library entries at ../lib/,
and put the JUnit jar on the test source folders so the placeholder
AppTest classes compile.

ui-desktop: take the JavaFX jars off the modulepath (there is no
module-info.java, so module="true" left the packages unresolvable) and
add a Launcher that calls Application.launch, avoiding the "JavaFX
runtime components are missing" check without VM arguments.

engine: add LocalGuessMarketService and the GuessMarketContext provider
interface, and give GuessMarketException the no-arg and cause
constructors they need.

5 files changed, 93 insertions, 0 deletions

diff --git a/ui-desktop/.classpath b/ui-desktop/.classpath
new file mode 100644
index 0000000..bac8826
--- /dev/null
+++ b/ui-desktop/.classpath
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+    <!-- Defines your source folder -->
+  <classpathentry kind="src" output="bin/classes" path="src/main/java"/> 
+  <classpathentry kind="src" output="bin/test-classes" path="src/test/java">
+    <attributes>
+      <attribute name="test" value="true"/>
+    </attributes>
+  </classpathentry>
+    <!-- Defines the standard Java System Library -->
+    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+    <!-- Defines where compiled .class files go -->
+  <classpathentry kind="output" path="bin"/>    
+
+  <classpathentry kind="lib" path="../lib/junit/junit-platform-console-standalone-6.1.1.jar"/>
+  <!-- Required OpenJFX JARs explicitly placed on the Modulepath -->
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.base.jar"/>
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.controls.jar"/>
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.graphics.jar"/>
+  <classpathentry kind="lib" path="../lib/openjfx/javafx.fxml.jar"/>
+</classpath>
+
diff --git a/ui-desktop/.project b/ui-desktop/.project
new file mode 100644
index 0000000..e421bbf
--- /dev/null
+++ b/ui-desktop/.project
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+        <name>guess-market-ui-desktop</name>
+        <comment></comment>
+        <projects>
+        </projects>
+        <buildSpec>
+                <buildCommand>
+                        <name>org.eclipse.jdt.core.javabuilder</name>
+                        <arguments>
+                        </arguments>
+                </buildCommand>
+        </buildSpec>
+        <natures>
+                <nature>org.eclipse.jdt.core.javanature</nature>
+        </natures>
+        <filteredResources>
+                <filter>
+                        <id>1786044291088</id>
+                        <name></name>
+                        <type>30</type>
+                        <matcher>
+                                <id>org.eclipse.core.resources.regexFilterMatcher</id>
+                                <arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+                        </matcher>
+                </filter>
+        </filteredResources>
+</projectDescription>
diff --git a/ui-desktop/src/main/java/market/guess/ui/desktop/App.java b/ui-desktop/src/main/java/market/guess/ui/desktop/App.java
new file mode 100644
index 0000000..f0b2b7a
--- /dev/null
+++ b/ui-desktop/src/main/java/market/guess/ui/desktop/App.java
@@ -0,0 +1,22 @@
+package market.guess.ui.desktop;
+
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.control.Label;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+
+public class App extends Application {
+  @Override
+  public void start(Stage stage) throws Exception {
+    var javaVersion = System.getProperty("java.version");
+    var openjfxVersion = System.getProperty("javafx.version");
+
+    var label =
+        new Label("Hello. JavaFX " + openjfxVersion + ", running on Java " + javaVersion + ".");
+    var scene = new Scene(new StackPane(label), 640, 480);
+
+    stage.setScene(scene);
+    stage.show();
+  }
+}
diff --git a/ui-desktop/src/main/java/market/guess/ui/desktop/Launcher.java b/ui-desktop/src/main/java/market/guess/ui/desktop/Launcher.java
new file mode 100644
index 0000000..ffe9505
--- /dev/null
+++ b/ui-desktop/src/main/java/market/guess/ui/desktop/Launcher.java
@@ -0,0 +1,9 @@
+package market.guess.ui.desktop;
+
+import javafx.application.Application;
+
+public final class Launcher {
+  public static void main(String[] args) {
+    Application.launch(App.class, args);
+  }
+}
diff --git a/ui-desktop/src/test/java/market/guess/engine/AppTest.java b/ui-desktop/src/test/java/market/guess/engine/AppTest.java
new file mode 100644
index 0000000..0638bc1
--- /dev/null
+++ b/ui-desktop/src/test/java/market/guess/engine/AppTest.java
@@ -0,0 +1,12 @@
+package market.guess.engine;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class AppTest {
+  @Test
+  void deterministicTest() {
+    assertTrue(true);
+  }
+}