apache commons tutorial

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

Apache's common logging is a high-level log framework that does not implement real log writing capabilities, but relies on other log systems such as log4j or Java. util. logging. You can use the configuration file to set whether to use log4j or Java. util. logging. Java. utl. Logging is used by default. If you want to use log4j, You need to configure it in three steps,1. Create a log4j configuration file, such as log4j. proiperties:Log4j. rootlogger = debug, A1Log4j. appender. A1 = org.

Java executes the external program (Apache Commons Exec), apachecommons Use runtime.getruntime(cmd.exe c to call an external program. The current thread remains waiting in Tomcat. To solve this problem, the new thread was used to receive output information from external programs. For more information, see the blog http://blog.csdn.net/accountwcx/article/details/46785437. Later, I found open-source Java on

Inkfish original, do not reprint commercial nature, reproduced please indicate the source (http://blog.csdn.net/inkfish). Apache Commons Compress BZIP2 compression: (Source: Http://blog.csdn.net/inkfish) Package study.inkfish.compress; Import Java.io.BufferedInputStream; Import Java.io.BufferedOutputStream; Import Java.io.File; Import Java.io.FileInputStream; Import Java.io.FileOutputStream; Import java.io.

The maven dependency of Apache Commons Email1 Examples of Use: 1 package App.hihn.me.mail.demo; 2 3 Import java.net.MalformedURLException; 4 Import Java.net.URL; 5 6 Import Org.apache.commons.mail.DefaultAuthenticator; 7 Import Org.apache.commons.mail.Email; 8 Import org.apache.commons.mail.EmailAttachment; 9 Import org.apache.commons.mail.EmailException; Ten import Org.apache.commons.mail.HtmlEmail;

Apache Commons Transaction is designed to provide a lightweight, standardized, and efficient toolkit for multithreaded programming of Java transactions, enabling multilevel locks, transaction sets, and transaction-level file access.The transaction processing system is very familiar to the database users, but if the transaction processing system is transferred from the database to the file system, it is esti

I. Preface Java code farmers do not know Apache, so they will never miss it. There are many open-source projects under the company, all of which are sky-breaking. Today, let's talk about commons. Click this link to go to the Apache commons homepage, including logging, pool, net, ongl, El, Io, DBCP, email, collection, L

1. New Java project csvexample in Eclipse. 2. Add a CSV file:Create a new CSV file under the "\CSVEXAMPLE\SRC" directory, or copy the CSV file elsewhere to this directory.The contents are as follows: 3. Download the source and extract the Apache Commons CSV:https://commons.apache.org/proper/commons-csv/download_csv.cgiBinaries or source, whichever is OK. I've go

Although Google's guava a certain encapsulation of Java IO operations, but it is more in favor of the collection, concurrency and caching, in the actual project, I like guava very much, I also like the Apache Toolkit Org.apache.commons.io, which provides a very powerful tool capability that simplifies code logic, improves development efficiency and quality, and is a toolkit that every Java programmer should master. This article briefly introduce Org.a

For java. lang. NoClassDefFoundError: org/apache/commons/collections/FastHashMap During Java EE development, when data in the configuration file or user form submitted data is encapsulated in the corresponding attributes of the corresponding JavaBean object: in actual development, use the third method toolkit BeanUtils (the commons-beanutils-xxx.jar depends on t

This article is fromBlog, please be sure to keep this source http://zhangjunhd.blog.51cto.com/113473/18331 Place the Apache commons-fileupload.jar under the WEB-INF \ Lib of the application. The following is an example of how to use its file upload function.The used fileupload version is 1.2, and the Environment is eclipse3.3 + myeclipse6.0. Fileupload is based on com