我正在写一个工作计划，我已经被困这个问题了近一个星期了。无论我做什么，程序都会抛出相同的异常。
我查找了每个已知资源以及与此问题相关的每个问题，并且每次尝试和建议都失败了。根据我遇到的90％的帖子，它说我应该使用keytool将证书添加到我的keystore。这就是我的尝试：
keytool -import -alias abc -file ~/Downloads/\*.gcsip.nl #=> gcsip.nl is the certificate I downloaded from the browser.
它问了我一个密码，我添加了它，当我运行它时我的应用程序仍然无效。我查看了“如何将证书导入Eclipse项目”，他们建议我执行相同的命令。我以前从未处理过Java证书，但它确实是一个真正的绝对噩梦。
奇怪的是，有一天应用程序运行得非常好，当我开始工作时，这个异常开始发生。我几乎什么都没改变。
我还研究了其他Caused by:例外情况，包括Invalid keystore format，也没有解决这个问题。老实说，即使仔细阅读了Oracle文档，我仍然不知道密钥库是什么，是什么，应该是什么样子。
我只是在找一个有过这个问题经验的人，他可以详细说明（比如我5岁）关于密钥库如何工作以及如何解决它。非常感谢任何帮助。
我应该注意到我不是很了解Java。
这是我的StackTrace：
java.net.SocketException: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)
at javax.net.ssl.DefaultSSLSocketFactory.throwException(SSLSocketFactory.java:248)
at javax.net.ssl.DefaultSSLSocketFactory.createSocket(SSLSocketFactory.java:255)
at sun.net.www.protocol.https.HttpsClient.createSocket(HttpsClient.java:409)
at sun.net.NetworkClient.doConnect(NetworkClient.java:162)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1104)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)
at GCollect.authorize(GCollect.java:102)
at TestCase.main(TestCase.java:20)
Caused by: java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext)
at java.security.Provider$Service.newInstance(Provider.java:1617)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:236)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:164)
at javax.net.ssl.SSLContext.getInstance(SSLContext.java:156)
at javax.net.ssl.SSLContext.getDefault(SSLContext.java:96)
at javax.net.ssl.SSLSocketFactory.getDefault(SSLSocketFactory.java:122)
at javax.net.ssl.HttpsURLConnection.getDefaultSSLSocketFactory(HttpsURLConnection.java:332)
at javax.net.ssl.HttpsURLConnection.<init>(HttpsURLConnection.java:289)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.<init>(HttpsURLConnectionImpl.java:85)
at sun.net.www.protocol.https.Handler.openConnection(Handler.java:62)
at sun.net.www.protocol.https.Handler.openConnection(Handler.java:57)
at java.net.URL.openConnection(URL.java:972)
at GCollect.authorize(GCollect.java:100)
... 1 more
Caused by: java.io.IOException: Invalid keystore format
at sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:650)
at sun.security.provider.JavaKeyStore$JKS.engineLoad(JavaKeyStore.java:55)
at java.security.KeyStore.load(KeyStore.java:1445)
at sun.security.ssl.TrustManagerFactoryImpl.getCacertsKeyStore(TrustManagerFactoryImpl.java:226)
at sun.security.ssl.SSLContextImpl$DefaultSSLContext.getDefaultTrustManager(SSLContextImpl.java:767)
at sun.security.ssl.SSLContextImpl$DefaultSSLContext.<init>(SSLContextImpl.java:733)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at java.security.Provider$Service.newInstance(Provider.java:1595)
... 13 more