优化 500 页面。

common/src/main/java/com/jeesite/common/lang/ExceptionUtils.java

@@ -31,6 +31,28 @@ public class ExceptionUtils {
 		}
 		return ex;
 	}
+	
+	public static String getExceptionMessage(Throwable ex){
+		String message = null;
+		Throwable e = ex;
+		while (true){
+			if (e == null){
+				break;
+			}
+			if (StringUtils.startsWith(e.getMessage(), "msg:")){
+				message = StringUtils.replace(e.getMessage(), "msg:", "");
+				break;
+			}else if ("com.jeesite.common.service.ServiceException"
+					.equals(e.getClass().getName())){
+				message = e.getMessage();
+				break;
+			}
+			if (StringUtils.isBlank(message)){
+				e = e.getCause();
+			}
+		}
+		return message;
+	}
 
 	/**
 	 * 将ErrorStack转化为String.

modules/core/src/main/resources/views/error/500.html

@@ -7,17 +7,12 @@ var ex;
 if (isBlank(message)){
 	ex = @ExceptionUtils.getThrowable(request);
 	if (ex != null){
-		for (e in [ex, ex.cause!, ex.cause.cause!]){
-			if (@StringUtils.startsWith(e.message!, "msg:")){
-				message = @StringUtils.replace(e.message!, "msg:", "");
-				break;
-			}else if (type.fullName(e) == 'com.jeesite.common.service.ServiceException'){
-				message = e.message!;
-				break;
-			}
+		var m = @ExceptionUtils.getExceptionMessage(ex);
+		if (isNotBlank(m)){
+			message = m;
 		}
 		if (!@StringUtils.equals(message, "演示模式，不允许操作！")){
-			@org.slf4j.LoggerFactory.getLogger("error/500").error(ex.message, ex);
+			@org.slf4j.LoggerFactory.getLogger("error/500").error('', ex);
 		}
 	}
 }