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Exception in thread "main" 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:123)
   at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:318)
   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:184)
   at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
   at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
   at com.bjsxt.test.HttpClientTest.doGetParam(HttpClientTest.java:60)
   at com.bjsxt.test.HttpClientTest.main(HttpClientTest.java:18)
Caused by: java.security.NoSuchAlgorithmException: SunTls12RsaPremasterSecret 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)
   ... 23 more

JAVA 全系列/（旧的隐藏）第七阶段：JAVA 高级技术/HttpClient 8506楼

onmouseleave和onmouseout有什么区别

Python 全系列/第七阶段：网页编程基础/JavaScript 8507楼

#pip install python-pptx
from pptx import Presentation
def creat_ppt():
    #创建ppt对象
    ppt = Presentation()
    #添加幻灯片
    ppt.slides.add_slide(ppt.slide_layouts[0])
    #保存
    ppt.save('./creat_ppts/01_ppt.pptx')

if __name__ == '__main__':
    creat_ppt()

Traceback (most recent call last):

File "D:\Users\W9020478\AppData\Local\Programs\Python\Python311\Lib\site-packages\pptx\compat\__init__.py", line 10, in <module>

Container = collections.abc.Container

^^^^^^^^^^^^^^^

AttributeError: module 'collections' has no attribute 'abc'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "f:\vscode\auto_ppt\01creat_ppt.py", line 2, in <module>

from pptx import Presentation

File "D:\Users\W9020478\AppData\Local\Programs\Python\Python311\Lib\site-packages\pptx\__init__.py", line 14, in <module>

from pptx.api import Presentation # noqa

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "D:\Users\W9020478\AppData\Local\Programs\Python\Python311\Lib\site-packages\pptx\api.py", line 15, in <module>

from .package import Package

File "D:\Users\W9020478\AppData\Local\Programs\Python\Python311\Lib\site-packages\pptx\package.py", line 6, in <module>

from pptx.opc.package import OpcPackage

File "D:\Users\W9020478\AppData\Local\Programs\Python\Python311\Lib\site-packages\pptx\opc\package.py", line 11, in <module>

from pptx.compat import is_string, Mapping

File "D:\Users\W9020478\AppData\Local\Programs\Python\Python311\Lib\site-packages\pptx\compat\__init__.py", line 14, in <module>

Container = collections.Container

^^^^^^^^^^^^^^^^^^^^^

AttributeError: module 'collections' has no attribute 'Container'

这是什么错误

Python 全系列/ 第十四阶段：自动化操作办公软件、邮件、定时任务等/办公自动化 8508楼

信息: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.

java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.

at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1305)

at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:986)

at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.checkContextClassLoaders(AbandonedConnectionCleanupThread.java:96)

at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:69)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)

at java.base/java.lang.Thread.run(Thread.java:844)

浏览器显示无限循环重定向，不知道什么原因

JAVA 全系列/第六阶段：项目管理与SSM框架/RBAC实战 8509楼

老师这个地方的train_bottleneck，视频里说不对darknet53训练了，是什么意思？darknet53是一个配置文件，里边配置的是什么

人工智能/第十四阶段：深度学习-目标检测YOLO(V8正在更新中)实战/YOLOv3代码实战 8510楼

老师，我将数据包导入以后，没有出现连接地址，出错了是什么情况？

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
null
	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:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1122)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2260)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:787)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:49)
	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:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:357)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
	at java.sql.DriverManager.getConnection(DriverManager.java:664)
	at java.sql.DriverManager.getConnection(DriverManager.java:247)
	at cn.sxt.dubtil111.DBUtil.getConnection(DBUtil.java:25)
	at cn.sxt.dubtil111.DBUtil.main(DBUtil.java:51)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
	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:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1122)
	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2181)
	... 13 more
Caused by: java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at java.net.Socket.connect(Socket.java:538)
	at java.net.Socket.<init>(Socket.java:434)
	at java.net.Socket.<init>(Socket.java:244)
	at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)
	at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:293)
	... 14 more

出现了以上错误！

JAVA 全系列/第二阶段：JAVA 基础深化和提高/多线程和并发编程（旧） 8511楼

这个怎么解决呀

Python 全系列/第十五阶段：Python 爬虫开发/scrapy框架使用 8512楼

老师，这里的this到底代表啥意思

JAVA 全系列/第一阶段：JAVA 快速入门/面向对象详解和JVM底层内存分析 8513楼

for m in range(3):
7  for n in range(4):
8    print(a[m][n],end="\t")
9  print() #打印完一行，换行

老师您好，这个外边range里的3和内部嵌套range里的4如果是动态的可以像range(len(a)), range(width(a))这样表示吗？另外我发现好像没有width(a)这个用法，但为什么有len这个方法呢？

Python 全系列/第一阶段：Python入门/序列 8514楼

一、项目部署后，打开网页链接，网页出现下面报错：

1.网页链接报错如下：

2. Error log:mengbo.pythonanywhere.com.error.log 报错信心如下：

二、根据错误信息百度搜索如何调试。

根据：

Not Found: /favicon.ico

错误信息提示。

在百度搜到是显示网页图标问题，可以在<head></head>标签中添加如下代码：（可省略制作图标）

照上面代码修改后还是报错。报错信息如下：

再根据

 Not Found: /

错误信息提示。

在百度搜索，未找到符合内容信息。

三、自己项目压缩包及Pythonanywhere网站配置如下：

1、项目压缩包

blog.zip

2Pythonanywhere网站配置如下：

Code:

What your site is running.

Source code:/home/mengbo/test9blog Go to directory

Working directory:/home/mengbo/ Go to directory

WSGI configuration file: /var/www/mengbo_pythonanywhere_com_wsgi.py

Python version: 2.7

Virtualenv:

Use a virtualenv to get different versions of flask, django etc from our default system ones. More info here. You need to Reload your web app to activate it; NB - will do nothing if the virtualenv does not exist.

/home/mengbo/blogenv

Start a console in this virtualenv

Static files:

Files that aren't dynamically generated by your code, like CSS, JavaScript or uploaded files, can be served much faster straight off the disk if you specify them here. You need to Reload your web app to activate any changes you make to the mappings below.

URL	Directory	Delete
/static/	/home/mengbo/test9blog/static/css
/static/admin/	/home/mengbo/blogenv/lib/python2.7/site-packages/django/contrib/admin/static/admin
/static/ckeditor/	/home/mengbo/blogenv/lib/python2.7/site-packages/ckeditor/static/ckeditor
Enter URL	Enter path

3、

四。问题

上面Bug如何正确调试（建议：如有参考答案，请列出）

Python 全系列/第九阶段：Python_Django2 框架（隐藏）/Django项目阶段-博客项目 8515楼

老师我按照视频输入了代码为什么窗口瞬间就没，我加turtle.done() 了，我用的vscode,pycharm没法用

Python 全系列/第一阶段：Python入门/Python入门（动画版） 8516楼

他这个换顺序之后我把next后面的Line都删掉就可以正常运行了，那既然有没有Line都可以运行，而且nextLine()方法前面还不能用别的next方法，既然还有这种不便，那Line存在的意义是什么？是要区分数据吗？还请老师解惑。

JAVA 全系列/第一阶段：JAVA 快速入门/变量、数据类型、运算符 8517楼

怎么打开python环境啊

Python 全系列/第四阶段：函数式编程和核心特性/内存管理 8518楼

老师，我自己在写PlaneGame0.2项目的时候，把加载图片的代码（Image ball = GameUtil.getImage("images/ball.png");）写到paint()方法里面了，竟然也能显示出来。请问，这句代码写在paint()方法体外面和里面，两种写法有什么区别？写在paint()方法体外面，什么时候会执行getImage()方法呢？（通过调试、看不出来什么时候执行paint()方法）我理解程序的执行顺序是：main()--launch()--paint()，程序是这样执行的吗？

JAVA 全系列/第一阶段：JAVA 快速入门/飞机大战小项目训练 8519楼

Person:

  ():
    (.format())

p1 = Person()
p2 = Person()
p2
()

销毁对象：<__main__.Person object at 0x0000026840A592E0>

程序结束

销毁对象：<__main__.Person object at 0x0000026840A59340>

老师，请问这里del p2 为什么后面会输出销毁对象

Python 全系列/第一阶段：Python入门/面向对象 8520楼

Code:

Virtualenv:

Static files:

同学您好