当我尝试在Tomcat 7上运行我的webapp时,我得到以下异常:
exception
javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;
" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext,
have different Class objects for the type javax/el/ExpressionFactory used in the signature
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:343)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for …我已经下载了一个rails开源webapp,当我开始使用时:
C:\Users\admin\Downloads\iCare\icare-develop>rails server
?[31mCould not find kgio-2.8.0 in any of the sources?[0m
?[33mRun `bundle install` to install missing gems.?[0m
我尝试使用以下方法修复此错误:
cmd:>gem install kgio -v '2.8.0'
我收到了错误:
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing kgio:
ERROR: Failed to build gem native extension.C:/Ruby193/bin/ruby.exe extconf.rb
checking for CLOCK_MONOTONIC in time.h... no
checking for CLOCK_MONOTONIC() in time.h... no
checking for clockid_t in time.h... no
checking for clock_gettime() in -lrt... no
checking for t_open() in …错误CS0266:无法将类型'object'隐式转换为'int'.存在显式转换(您是否错过了演员？)
int dd= 6000;
sqlCmdDefaultTime = new SqlCommand("myQuery", sqlCon);
sqlDefaultTime = sqlCmdDefaultTime.ExecuteReader();
while (sqlDefaultTime.Read())
{
dd= sqlDefaultTime[1];
}
我怎么能投
可能重复:
插入符号在C++/CLI中的含义是什么？
^在这个例子中意味着什么？
String^ dd= Convert::ToString(DateTime::Now);
或array<String^,2>^或 OleDbCommand^等等...
我一直在网上寻找一段时间,一般来说,什么是CRUD(创建,删除,更新,删除)cassandra集群/密钥空间/列系列和列的最佳方法是什么？
有很多框架和驱动程序和api(节俭,hector,datastax驱动程序,cassandra sharp驱动程序,aquiles,fluentcassandra ...),我真的很困惑选择哪一个.
任何人都可以提供一份关于做这种事情的最佳方式的小简历/概述吗？
提前致谢
我有2个这样的功能:
//Function1
public int function1()
{
...//some code
}
//function2
public double function2()
{
...//some code
}
//Main
public static void Main(string[] args)
{
function1()
function2()
}
在我的Main方法中,我怎么能function1()先打电话呢function2()？然后睡30秒,并再次调用function1()第一和之后function2(); 睡30秒 等等......？
谢谢
我不是TSQL的专家,我有这个功能:
for (i=1;i<=30;i++) {
for (j=1;j<=10;j++){
insert into NAMES values ("","","Name"+i+" - fn"+j", "Name"+i+" - fn"+j", "Numeric", "R",0,"N",0,"00");
}
}
我想将它转换为SQL函数,以便一次插入所有这300条记录(30x10).