In the beginning, I configured user libraries (Struts-2.2.3 for multiple projects) according to a textbook ), then introduce Struts-2.2.3 directly (this package will not be placed in the project folder ):
However, the program cannot be started due to an error as shown in the following figure:
Severe: exception starting filter struts2Java. Lang. classnotfoundexception: org. Apache. struts2.dispatcher. Ng. Filter. strutsprepareandexecutefilterAt
Org. springframework. web. context. ContextLoaderListener solution,
Recently deployed ssm project in tomcat. When tomcat is started, the org. springframework. web. context. ContextLoaderListener error is reported.
Severe: Error Processing ing application listener of class org. springframework. web. context. contextLoaderListenerjava. lang. classNotFoundException
Org. apache. httpcomponents: httpclient tool class, java tool class
Httpclient version 4.4.1
Because http connections require three handshakes, resources and time are wasted when frequent calls are required.
Therefore, the connection pool is used for connection.
Change the maximum connection pool connections and maximum route connections as needed
Another thing to note is that
// Release the Socket stream response. close (); // release Connection //
Recently, I was working on the spring + struts2 + ibatis project. Yesterday, the eclipse server started normally. As a result, an error is always reported as follows:
Severe: Error Handling ing application listener of class org. springframework. Web. Context. contextloaderlistenerJava. Lang. classnotfoundexception: org. springframework. Web. Context. contextloaderlistenerAt
This exception means that the int type cannot be assigned null, while the integer type can.
If the int value can be null in the MySQL database, the integer type should be used in my modle class and ing file.
This is not the same as the automatic unpacking of Java 5.
Integer I = 3; // auto-boxing int A = I + 3; // auto-Unpacking
Note the NULL pointer exception (nullpointerexception) When unpacking )!
For example, integer x = NULL;Int y = X;
Solution:
Set the original
I took a look at the tutorial a few days ago and tried to configure hibernate on the Web. when there was a tragedy, the following error message was prompted:
Information: hibernate validator bean-validator-3.0-JBoss-4.0.2Exception in thread "Main" org. hibernate. hibernateexception: unable to get the default bean validation factoryat Org. hibernate. cfg. beanvalidation. beanvalidationactivator. applyddl (b
Exception error:
Caused by: Org. apache. commons. DBCP. sqlnestedexception: cannot create poolableconnectionfactory (the database is already in use by another process: Org. HSQLDB. persist. niolockfile @ 4a60a3da: Java. lang. exception: the process cannot access the file because another program has locked part of the file. : D:/Zhao/code/OTAs-ds-workspace/OTAs-ds-server/output/funambol/tools/hypersonic/data
Org. apache. catalina. loader. WebappClassLoaderBase. clearReferencesJdbc The web application [xx] has an exception,
Exception details:
31-Jan-2018 16:30:40.843 WARNING [localhost-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [spicy_dev] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the
Exception in thread "main" java. lang. NoClassDefFoundError: org/apache/commons/logging/LogFactory, commonslogfactory
An exception occurred when learning Spring AOP from scratch when I was writing a Java Web framework:
"C: \ Program Files \ Java \ jdk1.7.0 _ 40 \ bin \ java"-Didea. launcher. port = 7533 "-Didea. launcher. bin. path = D: \ JetBrains \ xxIntelliJ IDEA 2016.3 \ bin "-Dfile. encoding = UTF-8-classpath "C: \ Program Files \ Java \ jdk1.7.0
. Metadata \. plugins \ org. eclipse. wst. server. core \ tmp0 \ wtpwebapps \ problem, tmp0wtpwebapps
Configure the eclipse development environment, jdk installation path, and tomcat installation path. Create a Dynamic Web Project zhgy under eclipse. When you use a new tomcat in eclipse and start this tomcat to publish a Dynamic Web Project, in fact, the project is not released to the webapps directory where tomcat installation is located. This can b
If an object with the same OID (primary key) already exists in the session of hibernate save, an exception occurs. The details are as follows:
Exception in thread "Main" org. hibernate. nonuniqueobjectexception: a different object with the same Identifier value was already associated with the session: [COM. unmi. loandetail #1]At org. hibernate. event. Def. abstractsaveeventlistener. abstrmsave (abstractsav
This is the second article on multi-organization access.AnilPassiMultiOrg R12
We all know that in OracleThe Multi org model in Release 12 is changed. It is called multi org Access Control (MOAC ). I will tell you the reason for this change and how it will affect you. I will also tell you how to avoid affecting your existing settings at all [if you do not want to useMOAC-multi-organization access control]
I
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.