Clinical manifestations:
Use spring AOP dynamic proxy;
The Bean class that is managed with spring inherits from an interface;
The spring container has the ID of the bean you want to proxy, but the ID cannot be cast to the Bean class.
cases:To define a proxy class:@Transactional@Repositorypublic UserDaoImpl implements UserDao extends BaseDaoImpl{/*没有实现任何接口*/}Get the proxy class:new ClassPathXmlApplicationContext("applicationContex
Double
Forcing data type conversionsThe format of the cast is to add "()" before the data that needs to be transformed, and then add the data type that needs to be converted in parentheses. Some data after transformation operation, the accuracy will be lost, and some will be more accurate, the following example can illustrate this problem.
Public class Demo {
public static void main(String[] args){
int x;
double y
;double
Note: Long is 8 bytes and float is 4 bytes.
A long is an integer, float is a floating-point type, and an integer is not stored with a floating-point number, and remember that a long range is less than float.
Cases:
BYTE a=10;int b=a;
When Intb=a is compiled, a is implicitly converted to type int.
Forced conversions
Characteristics:
From big to small (if you know explicitly that data can be represented by that data type, you can use a cast
Leo Resume Studio has been operating for 3 days, received a resume has been hundred, today I say that a few days to resume the general problems encountered and my team behind.
In the resume I received, the 3 outstanding questions, though simple enough to cause our sudden death.
1, do not send the attachment resume
The attachment resume is cast to a strange company and will only be deleted directly. Care for everyone is relatively busy, especially ever
Compile time Warning: warning:assignment makes pointer from integer without a cast
This warning occurs because the function is not declared before the function is used, and the undeclared function prototype defaults to the return int value.
This is the equivalent of calling a function with a return value of int and assigning it to the char* variable, all of which will appear as a warning.
warning:assignment makes pointer from integer without a
Treatment of domestic wastewater by CAST v0.9.11 1CD circulating activated sludge processCirculating activated sludge method (a kind of domestic sewage treatment process, it is based on the SBR process, the addition of the selector and sludge return facilities, and the timing of some adjustments, thus greatlyThe reliability and efficiency of SBR process are high. )Compared with the conventional SBR method, the main characteristic of this process is th
N.categoryid C.categoryid,c.[name]First query statement: Select C.categoryid,c.[name] from Category C left join News N in C.categoryid=n.categoryid where N.categoryid is NullSecond query statement: Select Categoryid,[name] from category where NOT exists(SELECT * FROM News where Category.categoryid=news.categoryid)* The first performance is undoubtedly the best when the CategoryID is not repeated in the news table, whereas the second performance is good.11.SQL Statement conversion Format functio
Label:In SQL Server, both the cast and CONVERT functions are available for type conversions, and their functions are the same. It's just a different syntax. Cast is generally easier to use, and the advantage of convert is that dates and values can be formatted. Select CAST('123' as int)--123
Select CONVERT(int,'123')--123
Select
Today encountered a mistake also do not know how to do, the Internet searched for a bit;The problem arises: Java.lang.ClassCastException:android.widget.Button cannot is cast to Android.widget.ImageViewThe workaround is to:
Clean your project. (Click Project above Eclipse and clean then select the item you want to clean)
Modify an XML file and save it (move it a little, save it)
Delete the R file. (build is generated automatically after bui
Use MAVEN to develop a Web application that starts with an error:class: Javax/servlet/servlet. classThen output the error:Severity: Exception starting filter EncodingFilterjava.lang.ClassCastException: Org.springframework.web.filter.CharacterEncodingFilter cannot is cast to Javax.servlet.FilterThe cause of the problem is that the server-:tomcat starts to read all the jar packages in the Tomcat/lib directory into memory and fails to load if the same pa
A System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B] System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from "System.Web.WebPages.Razor, version=2.0.0.0, Culture=neutral, publickeytoken=31bf3856ad364e35" (In the context "Default" In the "C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\ System.Web.WebPages.Razor.dll "location). Type B originates from "System.
Issue : The following exception occurred when developing an application using Spring (v4.1.7) and Hibernate (v4.3.10.final):Java.lang.ClassCastException:org.springframework.orm.hibernate4.SessionHolder cannot is cast to Org.springframework.orm.hibernate3.SessionHoldercause : One possible reason is that the hibernatedaosupport of Hibernate v3 is used in the DAO class.Solve:An exception occurs using the following class:Org.springframework.orm.hibernate3
1. Error descriptionJava.lang.ClassCastException:java.lang.Integer cannot is cast to Java.lang.Stringservice.impl.ArrivalBillServiceImpl.exportBillExcel (billserviceimpl.java:266) at SUN.REFLECT.NATIVEMETHODACCESSORIMPL.INVOKE0 (Native Method) at Sun.reflect.NativeMethodAccessorImpl.invoke ( nativemethodaccessorimpl.java:57) at Sun.reflect.DelegatingMethodAccessorImpl.invoke ( delegatingmethodaccessorimpl.java:43) at Java.lang.reflect.Method.invoke (m
MAVEN builds struts2 engineering times wrongSeverity: Exception Starting filter Struts2Java.lang.ClassCastException:org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter cannot be cast To Javax.servlet.FilterProject is copied, so from pom.xml import when some jar package reference clean dirty, finally find the reason is conflict with Servlet-api, Pom.xml in the introduction of SERVLET-API to delete canMaven Struts2 Project Strutsprepar
Today in the development of a problem encountered, in this record, the problem is probably the meaning of the type is inconsistent can not be a strong turnThe code is as follows:ROLF.SETFUNCD (String) rece.get ("FUN_CD");//strong Transfer Rolf.setfunid ((string) rece.get ("fun_id");Strong Turn rolf.setfunnm (String) rece.get ("fun_nm"); Strong turnBecause my second paragraph of code the field type of the ORC database is number, and the entity type is stringSo I was in the execution of the error,
Critical: Failed to initialize end point associated with Protocolhandler ["http-bio-8080"]java.net.bindexception:address Alrea Dy in use What's wrong with being annoyed at the mistake of appearing?Caused By:java.lang.ClassCastException:org.springframework.web.SpringServletContainerInitializer cannot is cast to Javax.servlet.ServletContainerInitializerSeeing this is like saying there's a conflict in my servlet bag.Since I have set up here to automatica
Caused By:java.lang.ClassCastException:org.ksoap2.SoapFault cannot is cast to Org.ksoap2.serialization.SoapObjectIt bothered me for a long time to report such a similar mistake. The occasional newspaper is not always reported.It turns out to be a little less judgmental, because the server is not necessarily the result we want to return each time.See figurePuzzled for a long time, finally in the StackOverflow inside only to find the answer.Probably is
Java.lang.ClassCastException:java.util.ArrayList cannot is cast to Java.lang.Long at Redis.clients.jedis.Connection.getIntegerReply (Connection.java:222) at Redis.clients.jedis.Jedis.exists (Jedis.java:127) at redis.clients.jedis.ShardedJedis.exists ( Shardedjedis.java:+)Jedis did not turn off the data that resulted in the next read is also mixed with the data of the last operation, causing the Jedis to parse itself correctly into the desired
Operating system WINDOWS7Previously loaded 2003, loaded 2007, loaded 2010, installed WPS.Convert Word to PDF, can not be converted, there is no special hint, the internet looked under, some people say it is not installed this thingHttp://download.microsoft.com/download/3/8/8/388812b2-0d3f-474e-a7ef-b095d3d0d3cd/SaveAsPDF.exePut the above all unloaded, loaded on 2007, there appeared the following in the problemA COM object of type ' Microsoft.Office.Interop.Word.ApplicationClass cannot be
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