fix: more resilient wrt to errors during shadow class building

src/main/java/spoon/reflect/factory/TypeFactory.java

@@ -7,6 +7,7 @@
  */
 package spoon.reflect.factory;
 
+import spoon.Launcher;
 import spoon.SpoonException;
 import spoon.reflect.code.CtNewClass;
 import spoon.reflect.cu.SourcePosition;
@@ -33,7 +34,6 @@
 import spoon.reflect.visitor.CtScanner;
 import spoon.reflect.visitor.filter.TypeFilter;
 import spoon.support.DefaultCoreFactory;
-import spoon.support.SpoonClassNotFoundException;
 import spoon.support.StandardEnvironment;
 import spoon.support.util.internal.MapUtils;
 import spoon.support.visitor.ClassTypingContext;
@@ -563,7 +563,12 @@ public <T> CtType<T> get(Class<?> cl) {
 				try {
 					newShadowClass = new JavaReflectionTreeBuilder(getShadowFactory()).scan((Class<T>) cl);
 				} catch (Throwable e) {
-					throw new SpoonClassNotFoundException("cannot create shadow class: " + cl.getName(), e);
+					Launcher.LOGGER.warn("cannot create shadow class: {}", cl.getName(), e);
+
+					newShadowClass = getShadowFactory().Core().createClass();
+					newShadowClass.setSimpleName(cl.getSimpleName());
+					newShadowClass.setShadow(true);
+					getShadowFactory().Package().getOrCreate(cl.getPackage().getName()).addType(newShadowClass);
 				}
 				newShadowClass.setFactory(factory);
 				newShadowClass.accept(new CtScanner() {

src/main/java/spoon/support/visitor/java/JavaReflectionTreeBuilder.java

@@ -296,7 +296,7 @@ public void visitField(Field field) {
 				CtLiteral<Object> defaultExpression = factory.createLiteral(field.get(null));
 				ctField.setDefaultExpression(defaultExpression);
 			}
-		} catch (IllegalAccessException e) {
+		} catch (IllegalAccessException | ExceptionInInitializerError | UnsatisfiedLinkError e) {
 			// ignore
 		}
 

src/test/java/spoon/support/visitor/java/JavaReflectionTreeBuilderTest.java

@@ -682,4 +682,31 @@ public boolean matches(CtType element) {
 		assertEquals(true, ctClass.isShadow());
 		assertEquals("foo", ctClass.getMethods().toArray(new CtMethod[0])[0].getSimpleName());
 	}
+
+	@Test
+	public void testCannotGetDefaultExpressionBecauseOfException() {
+		/*
+		 * contract:
+		 *    JavaReflectionTreeBuilder can't set defaultExpression for the field (public static primitive),
+		 *    as Reflection API throws the exception ExceptionInInitializerError when attempting to get it.
+		 *    {@link JavaReflectionTreeBuilder#visitField(Filed)} ignores this exception.
+		 */
+		CtType<?> ctType = new JavaReflectionTreeBuilder(createFactory()).scan(spoon.support.visitor.java.testclasses.NPEInStaticInit.class);
+
+		CtField<?> value = ctType.getField("VALUE");
+		// should have gotten '1'
+		assertNull(value.getDefaultExpression());
+
+		/*
+		 * contract:
+		 *    JavaReflectionTreeBuilder can't set defaultExpression for the field (public static primitive),
+		 *    as Reflection API throws the exception UnsatisfiedLinkError when attempting to get it.
+		 *    {@link JavaReflectionTreeBuilder#visitField(Filed)} ignores this exception.
+		 */
+		ctType = new JavaReflectionTreeBuilder(createFactory()).scan(spoon.support.visitor.java.testclasses.UnsatisfiedLinkErrorInStaticInit.class);
+
+		value = ctType.getField("VALUE");
+		// should have gotten '1'
+		assertNull(value.getDefaultExpression());
+	}
 }

src/test/java/spoon/support/visitor/java/testclasses/NPEInStaticInit.java

@@ -0,0 +1,20 @@
+package spoon.support.visitor.java.testclasses;
+
+public class NPEInStaticInit {
+
+  private static class InnerClass {
+    public void doSmt(){ }
+  }
+
+  public static int VALUE = 1; // because of this field
+
+  static {
+    System.out.println("This text will be printed"); // NOTE
+  }
+
+  public static InnerClass someObject = null;
+
+  static {
+    someObject.doSmt();      // NPE !!!
+  }
+}

src/test/java/spoon/support/visitor/java/testclasses/UnsatisfiedLinkErrorInStaticInit.java

@@ -0,0 +1,10 @@
+package spoon.support.visitor.java.testclasses;
+
+public class UnsatisfiedLinkErrorInStaticInit {
+
+  public static int VALUE = 1; // because of this field
+
+  static {
+    System.load("not found path!");
+  }
+}