Error when we try to log in

HI,

We have this error message when we try to log in confluence:

Cause
java.lang.NullPointerException
at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:721)
Stack Trace:[hide]

java.lang.NullPointerException
at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:721)
at org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)

LOG ERROR
Exception in thread "Timeout guard" java.lang.NoClassDefFoundError: Could not initialize class javax.crypto.JceSecurity
at javax.crypto.Cipher.getInstance(Cipher.java:499)
at sun.security.ssl.JsseJce.getCipher(JsseJce.java:224)
at sun.security.ssl.CipherBox.<init>(CipherBox.java:150)
at sun.security.ssl.CipherBox.newCipherBox(CipherBox.java:208)
at sun.security.ssl.CipherSuite$BulkCipher.newCipher(CipherSuite.java:467)
at sun.security.ssl.CipherSuite$BulkCipher.isAvailable(CipherSuite.java:507)
at sun.security.ssl.CipherSuite$BulkCipher.isAvailable(CipherSuite.java:485)
at sun.security.ssl.CipherSuite.isAvailable(CipherSuite.java:190)
at sun.security.ssl.SSLContextImpl.getApplicableCipherSuiteList(SSLContextImpl.java:342)
at sun.security.ssl.SSLContextImpl.getDefaultCipherSuiteList(SSLContextImpl.java:300)
at sun.security.ssl.SSLSocketImpl.init(SSLSocketImpl.java:576)
at sun.security.ssl.SSLSocketImpl.<init>(SSLSocketImpl.java:446)
at sun.security.ssl.SSLSocketFactoryImpl.createSocket(SSLSocketFactoryImpl.java:140)
at org.apache.commons.httpclient.protocol.SSLProtocolSocketFactory.createSocket(SSLProtocolSocketFactory.java:82)
at org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory$1.doit(ControllerThreadSocketFactory.java:91)
at org.apache.commons.httpclient.protocol.ControllerThreadSocketFactory$SocketTask.run(ControllerThreadSocketFactory.java:158)
at java.lang.Thread.run(Thread.java:745)

Thanks for your help