1、警告:The tag handler class for "s:form"(org.apache.struts2.views.jsp.ui.FormTag) was not found on the JavaBuild Path
这个问题终于可以解决了,在出问题的页面 <s:form> 标签前后删除空格后保存文件警告即可消失,即<s:form>为改行的起始,然后保存。
2、Eclipse下javacompiler level does not match the version of theinstalled Java project facet的问题 .
javacompilerfaceteclipsepropertiesjdk问题现象:项目图标报错“Java compiler level does not match the version of theinstalled Java project facet.”。
分析原因:根据错误信息的字面意思,应该是Java版本设定不一致的问题。而且这个Java版本跟Project安装的有关系。
解决办法:
既然是project出的问题,自然要从项目属性入手。其实很简单,
修改项目的org.eclipse.wst.common.project.facet.core.xml
<installed facet="jst.web"version="2.5"/> --Dynamic Web Moudle Version
<installed facet="java"version="1.5"/> --java Version
根据自身机器开发环境设置
或者
右键项目“Properties”,在弹出的“Properties”窗口左侧,单击“Project Facets”,打开“Project Facets”页面。
在页面中的“Java”下拉列表中,选择“1.5”
3、Struts2 + spring
需要在pom.xml中加入:
<!-- struts2 spring plugins -->
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-spring-plugin</artifactId>
<version>2.3.16</version>
</dependency>
同时在struts.xml中加入
<!-- 将Action交给spring容器管理 -->
<constant name="struts.objectFactory"value="spring" />
4、Eclipse : An error occurred while filtering resources
解决:Maven ->Update Project... resolved this problem for me
5、org.dom4j.DocumentException:Software caused connection abort:recv failed
这个错误有可能是hibernate的配置文件.hbm.xml里
<!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
这个声明有问题
用下面这个解决问题
<!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.NET/hibernate-configuration-3.0.dtd">
如果不行,则是颠倒过来,即如果原来使用
<!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
则用
<!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
6、Cannot change version of project facet Dynamic Web Module to3.0. 和 One or more constraints have not been satisfied.
需要修改 project的 properties的 project facts的 Dynamic Web Moudle Version版本和 web.xml中的版本一直,然后在通过maven update
以下为 web.xml的各个版本:
web.xml v2.3
[xml] view plaincopy
1. <?xml version="1.0" encoding="ISO-8859-1"?>
2. <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
3.
4. <web-app>
5.
6. </web-app>
web.xml v2.4
[xml] view plaincopy
1. <?xml version="1.0" encoding="UTF-8"?>
2. <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4. xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
5.
6. </web-app>
web.xml v2.5
[xml] view plaincopy
1. <?xml version="1.0" encoding="UTF-8"?>
2. <web-app xmlns=<a target="_blank" href="http://java.sun.com/xml/ns/javaee">http://java.sun.com/xml/ns/javaee</a>
3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4. xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
5. version="2.5">
6.
7. </web-app>
web.xml v3.0
[xml] view plaincopy
1. <?xml version="1.0" encoding="UTF-8"?>
2.
3. <web-app
4. version="3.0"
5. xmlns="http://java.sun.com/xml/ns/javaee"
6. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
7. xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
8.
9. </web-app>
7、An internal error occurred during:"Updating MavenProject"
(
mvn archetype:generate -DgroupId=com.mkyong -DartifactId=HibernateExample -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
) --java application
(
mvn archetype:generate -DgroupId=com.mkyong -DartifactId=HibernateExample -DarchetypeArtifactId=maven-archetype-webapp -DinteractiveMode=false
) --java web application
命令行创建 maven 项目转为 eclipse项目时,在eclipse中打开存在的maven项目,不能通过 maven update解决:
问题提示:An internal error occurred during:"Updating MavenProject"
解决:
1、把该项目从eclipse中删除,不要删除掉项目文件(只是从eclipse项目视图中删除);
2、进入cmd ,然后进入到该项目目录下比如:E:\workspace\mavenProject ,其中mavenProject为项目名称;
3、执行命令:mvneclipse:clean;
4、检查项目目中是否还存在 .classpath、.project、.settings ,如果存在,则删除掉;
5、通过右键-->import-->Existing Maven Projects,重新导入即可。
8、
hibernate java.lang.UnsupportedOperationException: The user must supply a JDBC connection
是 hibernate的配置文件hibernate.cfg.xml配置存在问题,检查数据连接的driver_class、url、username、root等参数名及参数值是否正确
9、MySQL 中,如果hibernate的主键用 uuid.hex,报异常如下:
java.sql.BatchUpdateException: Data truncation: Data too longfor column ‘SID‘ at row 1 .
解决:
修改mysql的字符集和创建表的一样即可,比如创建表 create table aa() default charset=utf8 ;
那么通过命令:set names utf8 ; ,修改 mysql的字符集;
重新运行程序即可。
10、maven 在 eclipse中创建maven project报一下错误解决:
Could not resolvearchetypeorg.apache.maven.archetypes:maven-archetype-quickstart:RELEASE fromany of theconfigured repositories.
Could not resolve artifact
Failed to resolve versionfororg.apache.maven.archetypes:maven-archetype-quickstart:pom:RELEASE: Couldnotfindmetadataorg.apache.maven.archetypes:maven-archetype-quickstart/maven-metadata.xmlinlocal (E:\maven3\repository)
Failed to resolve versionfororg.apache.maven.archetypes:maven-archetype-quickstart:pom:RELEASE: Couldnotfindmetadataorg.apache.maven.archetypes:maven-archetype-quickstart/maven-metadata.xmlinlocal (E:\maven3\repository)
解决思路:
a、修改conf/settings.xml,在<mirrors>…</mirror>中间加入以下内容:
<mirror>
<id>ibiblio.org</id>
<name>ibiblio Mirror ofhttp://repo1.maven.org/maven2/</name>
<url>http://mirrors.ibiblio.org/pub/mirrors/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- UnitedStates, North Carolina-->
</mirror>
<mirror>
<id>cica.es</id>
<url>http://ftp.cica.es/mirrors/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Spain,Sevilla -->
</mirror>
<mirror>
<id>skynet.be</id>
<url>http://maven2.mirrors.skynet.be/pub/maven2</url>
<mirrorOf>central</mirrorOf>
<!-- Belgium-->
</mirror>
b、如果机器使用代理,则需要修改代理信息,在<proxies>…</proxies>之间加入
<proxy>
<id>my-proxy</id> <!—起一个名字-->
<active>true</active> <!—固定为true-->
<protocol>http</protocol><!—固定为http-->
<username>user</username><!—如果不需要设置,则屏蔽掉username属性—>
<password>pwd</password><!—如果不需要设置,则屏蔽掉password属性—>
<host>10.17.75.2</host><!—代理服务器地址-->
<port>3128</port><!—代理服务器端口-->
<nonProxyHosts>localhost|127.0.0.1</nonProxyHosts>
</proxy>
11、eclipse 执行 mvn install的时候报如下错误
[ERROR] Failed to parse plugin descriptor fororg.apache.maven.plugins:maven-install-plugin:2.3.1(E:\maven3\repository\org\apache\maven\plugins\maven-install-plugin\2.3.1\maven-install-plugin-2.3.1.jar):error in opening zip file -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -eswitch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, pleaseread the following articles:
[ERROR] [Help 1]http://cwiki.apache.org/confluence/display/MAVEN/PluginDescriptorParsingException
解决方法:
删除:E:\maven3\repository\org\apache\maven\plugins\maven-install-plugin\2.3.1目录,操作后:E:\maven3\repository\org\apache\maven\plugins\maven-install-plugin\下没有2.3.1目录,然后重新执行 mvn Install ;
如果执行 mvn Clear存在相同问题,这只需要删除对应的目录,让Maven重新下载对应的jar即可。
Cannot change version of project facet Dynamic Web Module to 3.1 (Eclipse Maven唯一解决方案)
If you want to use version 3.1 you need to use the following schema:
Note that 3.0 and 3.1 are different: in 3.1 there‘s no Sun mentioned, so simply changing 3_0.xsd to 3_1.xsd won‘t work
de><?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"></web-app>de>
Also, make sure you‘re depending on the latest versions in your pom.xml. That is,
de><plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>2.4</version> <configuration> ... </configuration></plugin>de>
and
de><dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope></dependency>de>
Also, you should compile with Java 7 or 8:
de><plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration></plugin>de>