Context: add sys prop to override strictness

If you want context creation to be lax by default,
you can now set scijava.context.strict=false and
the fail-fast behavior will be disabled by default.

Author: ctrueden

src/main/java/org/scijava/Context.java

@@ -58,6 +58,17 @@
  */
 public class Context implements Disposable {
 
+	// -- Constants --
+
+	/**
+	 * System property indicating whether the context should fail fast when
+	 * is attempts to instantiate a required service which is invalid or missing.
+	 * If this property is set to "false" then the context creation will attempt
+	 * to continue even when a required service cannot be instantiated. Otherwise,
+	 * the constructor will throw an {@link IllegalArgumentException} in that situation.
+	 */
+	public static final String STRICT_PROPERTY = "scijava.context.strict";
+
 	// -- Fields --
 
 	/** Index of the application context's services. */
@@ -393,7 +404,7 @@ private String createMissingServiceMessage(
 	}
 
 	private static boolean strict() {
-		return true;
+		return !"false".equals(System.getProperty(STRICT_PROPERTY));
 	}
 
 }