#19 - Exceptions on plugin lookup can now be submitted lazily.

Introduced overloads on PluginRegistry which instead of taking an exception instance immediately (which requires instance creation beforehand) now accept a Supplier<E> so that the exception creation can actually be delayed until it's really needed.

Deprecated the old methods taking exception instances directly.

core/src/test/java/org/springframework/plugin/core/SimplePluginRegistryUnitTest.java

@@ -21,10 +21,12 @@ import static org.junit.Assert.*;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import org.junit.Before;
 import org.junit.Test;
+import org.springframework.plugin.core.PluginRegistry.Supplier;
 
 /**
  * Unit test for {@link SimplePluginRegistry}.
@@ -130,4 +132,21 @@ public class SimplePluginRegistryUnitTest {
 
 		assertThat(registry.countPlugins(), is(0));
 	}
+
+	/**
+	 * @see #19
+	 */
+	@Test(expected = IllegalStateException.class)
+	public void testname() throws Exception {
+
+		registry = SimplePluginRegistry.create(Collections.<SamplePlugin> emptyList());
+
+		registry.getPluginFor("FOO", new Supplier<Exception>() {
+
+			@Override
+			public Exception get() {
+				return new IllegalStateException();
+			}
+		});
+	}
 }