webmagic使用官方例子GithubRepoPageProcessor报错?报错

代码是用http://webmagic.io/docs/zh/posts/ch4-basic-page-processor/pageprocessor.html这个链接的里面的代码。

依赖包

<dependency>
<groupId>us.codecraft</groupId>
<artifactId>webmagic-core</artifactId>
<version>0.5.3</version>
</dependency>
<dependency>
<groupId>us.codecraft</groupId>
<artifactId>webmagic-extension</artifactId>
<version>0.5.3</version>
</dependency>

错误信息如下：

[11:30:26][ INFO][         Spider]: 307 - Spider github.com started!
[11:30:26][ INFO][HttpClientDownloader]:  87 - downloading page https://github.com/code4craft
[11:30:27][ WARN][HttpClientDownloader]: 104 - download page https://github.com/code4craft error
javax.net.ssl.SSLKeyException: RSA premaster secret error
at sun.security.ssl.RSAClientKeyExchange.<init>(Unknown Source)
at sun.security.ssl.ClientHandshaker.serverHelloDone(Unknown Source)
at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
at sun.security.ssl.Handshaker.processLoop(Unknown Source)
at sun.security.ssl.Handshaker.process_record(Unknown Source)
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:275)
at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:254)
at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:117)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:314)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at us.codecraft.webmagic.downloader.HttpClientDownloader.download(HttpClientDownloader.java:92)
at us.codecraft.webmagic.Spider.processRequest(Spider.java:409)
at us.codecraft.webmagic.Spider$1.run(Spider.java:322)
at us.codecraft.webmagic.thread.CountableThreadPool$1.run(CountableThreadPool.java:74)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.security.NoSuchAlgorithmException: SunTlsRsaPremasterSecret KeyGenerator not available
at javax.crypto.KeyGenerator.<init>(KeyGenerator.java:169)
at javax.crypto.KeyGenerator.getInstance(KeyGenerator.java:223)
at sun.security.ssl.JsseJce.getKeyGenerator(Unknown Source)
... 28 more