What is up with this when i try getting  on minecraft?

500 Servlet Exception


function show() { document.getElementById('trace').style.display = ''; }

[show] java.lang.RuntimeException: No free connections!

java.lang.RuntimeException: java.lang.RuntimeException: No free connections!
at com.mojang.minecraft.web.UserDB.getUser(UserDB.java:292)
at com.mojang.minecraft.web.Users.loginWithUid(Users.java:35)
at _jsp._index__jsp._jspService(header.jsp:41)
at com.caucho.jsp.JavaPage.service(JavaPage.java:61)
at com.caucho.jsp.Page.pageservice(Page.java:578)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:273)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682)
at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:743)
at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:662)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: No free connections!
at com.mojang.minecraft.web.UserDB.getConnection(UserDB.java:44)
at com.mojang.minecraft.web.UserDB.getUser(UserDB.java:264)
at com.mojang.minecraft.web.Users.loginWithUid(Users.java:35)
at _jsp._index__jsp._jspService(header.jsp:41)
at com.caucho.jsp.JavaPage.service(JavaPage.java:61)
at com.caucho.jsp.Page.pageservice(Page.java:578)
at com.caucho.server.dispatch.PageFilterChain.doFilter(PageFilterChain.java:195)
at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:187)
at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:265)
at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:273)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:682)
at com.caucho.util.ThreadPool$Item.runTasks(ThreadPool.java:743)
at com.caucho.util.ThreadPool$Item.run(ThreadPool.java:662)
at java.lang.Thread.run(Thread.java:619)