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Failed to create webapp project with Maven in idea (without SRC and other file directory): received fatal Alert: Protocol_ Version solution

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Specific steps:

1. First, add a configuration to Maven Runtime: – dhttps. Protocols = tlsv1.2, as shown in the following figure

2. Create project or module

3. When selecting a webapp template, use the Maven below instead of the coco above

3. The rest is the normal flow of things, not to repeat

Created web project structure:

explain why :

Due to the insecurity of tlsv1.1 protocol and the PCI security standard, maven sonatype central warehouse no longer supports tlsv1.1 and the following protocol versions from June 18, 2018

For the original text, please refer to the official explanation of no longer supports tlsv1.1 and below

The JDK I use is 1.7. Although jdk1.7 supports TLS 1.2, it is disabled by default, so the received fatal Alert: protocol above will appear_ Version exception

The following table shows the default TLS protocol used by JDK in different versions of Oracle documents:

solutions:

scheme 1: upgrade JDK to 1.8

JDK1.8 TLS 1.2 is enabled by default, and this exception will not occur

PS: the price can be a bit high, especially for some old projects, which can not be upgraded just by upgrading

scheme 2: enable TLS 1.2 by adding – dhttps. Protocols = tlsv1.2 and configuring the Java runtime parameter

summary: if you are JDK 1.7, both schemes are OK (this article uses the second scheme). If you are 1.6 or below, it is recommended to upgrade JDK

For piix4_ Solution of SMBus * * host SMBus controller not enabled (detailed steps summary)

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The first time I installed Ubuntu 16.04, I met piix4_ The problem of SMBus * * host SMBus controller not enabled makes it impossible to access the Ubuntu desktop. After searching for various solutions on the Internet, I find that the same solution is written in different ways. It’s difficult for novices to understand the lack of a step. So I summarize the detailed solution process and hope to learn from you together. For the first time, I’ll write it in my own format

Difficulty: when I first learned Linux, I didn’t understand the VIM command, which is the biggest difficulty of this method

Step 1: if you can’t enter the desktop operation, press Ctrl + Alt + F1 ~ F6 to enter the command line terminal, use the command to operate, input your own account number, and then enter the password

Step 2: enter the root mode: enter the Su command, and then enter the password you set. There is a pit here. The premise is that you have set the root permission and set the root password. If not, you need to set it; Refer to this article: https://www.cnblogs.com/vitre/p/5227456.html

Step 3: enter the command lsmod | grep I2C_ Piix4, view I2C_ Piix4, note the space here

Step 4: enter the command VI/etc/modprobe.d/blacklist.conf to enter the blacklist. You need to be reminded that you have started to enter the VIM mode. The next step is to use a separate command technique. Because you are a beginner, you have made many mistakes. You can check the VIM commands and get familiar with them. You can see this article: https://blog.csdn.net/weixin_ 37657720/article/details/80645991

Step 5: press g to jump to the last line

Step 6: press I to enter editing mode

Step 7: add a line of blacklist I2C_ Piix4. Here, you can directly input the last line of the original code, and then press enter to form a separate line. This operation is to convert I2C into a single line_ Piix4 is forbidden. Here, I understand that blacklist is like a black box, in which unnecessary things are put and a small black room is closed

Step 8: press ESC to exit editing mode

Step 9: input “: WQ!”, Here is the VIM command, which means forced save and exit

Step 10: input sudo reboot to restart

Basically, the above operation can solve piix4_ SMBus * * host SMBus controller is not enabled, but it can’t guarantee that it can solve the problem of failing to enter the desktop. If it still can’t enter, it’s necessary to find other problems

Filesystem.squashfs error in installing Ubuntu – solution (for reference)

SquashfsErrors：

unable to boot from the Ubuntu LiveCD, due to SquashFS errors like this:

SQUASHFS error: sb_bread failed reading block 0x9d7f3
SQUASHFS error: Unable to read fragment cache block [275faa28]
SQUASHFS error: Unable to read page, block 275faa28, size 23a7

method1:adding the ide=nodma or acpi=off allowed them to work around this issuemethod2:

You can add those lines to the grub entry, either in the grub.conf file or either entering letter ‘e’ on the grub menu and after editing Control+x to boot:

Add to the grub line:

all_generic_ide pci=nommconf

Add to the kernel line:

ide=nodma acpi=off

Go to: install C extended compiler environment of Python under windows (solve the problem of “unable to find vcfarsall. Bat”

Individual articles are original or translated unless reprinted

Individual articles are welcome to be reprinted in various forms, but those over 18 years old are requested to indicate the source of the article, respect my labor and your intelligence

Link to this article: http://www.cnblogs.com/fbwfbi/p/4509622.html

N hasn’t started blogging for a long time. I always feel that I need to remember something casually. I’ve lost some things, technologies and tools. I’d better record every bit of them

In windows, PIP is used to install some third-party libraries of Python. Many of them use C to write some extensions and need to use VC + + compiler to compile and install (or use MinGW, generally not recommended). Otherwise, it will appear “ unable to find vcfarsall. Bat “. For example, python 2.7 needs to use VS2008 C + + compiler, while python3 to python3.4 (python3.5 will use vs2015) will use VS2010 to compile. However, anyone who has ever installed vs, a huge and bloated IDE, knows that it comes with a lot of Microsoft plug-ins that you don’t know whether they are useful or not. They occupy a lot of space on C disk and start slowly, although the interface function of IDE is barely passable. If the computer configuration is general, this thing will make n cards, generally do not do related development, there is no need to install the entire vs. For Python 2.7, Microsoft has a conscience. It directly launched Microsoft Visual C + + compiler for Python 2.7, which can be downloaded and installed directly. Then, in the start menu – “all programs”, find the corresponding directory, and according to your platform and python Version (select x86 or x64), click the corresponding command prompt to run. In this CMD window, you can enter the set command to check the environment variables. It is found that the parameters include =, path =, lib =, and libpath = have been set, so you can enter them directly

pip install numpy

You can install and compile the corresponding third-party modules and libraries. Sometimes the compilation process is long and you need to wait patiently

But for Python 3, it’s not so convenient. Because my Python 3.4 is 64 bit, it’s obviously impossible to use VS2010 express directly, because it only has x86 version by default, not 64 bit. Refer to a question and answer in stack overflow

Python PIP has issues with path for MS Visual Studio 2010 Express for 64-bit install on Windows 7

According to the above suggestions, I get the corresponding solution on this machine. First install VS2010 express, then install windows SDK 7.1, and finally install a 64 bit compiler patch

　　Microsoft SDK 7.1 (Windows 7)

　　VC-Compiler-KB2519277

PS: before installing SDK 7.1, please uninstall VC redistribute 2010 related component packages (including x86 and x64), otherwise an error will be reported

After completing the above steps, the basic MSVC compilation environment (including x64) has been configured. However, if you compile a project in the future, such as building a Qt5 project, the following errors will appear:

c:\program files (x86)\microsoft visual studio 10.0\vc\include\intrin.h(26):fatal error C1083: Cannot open include file: ‘ammintrin.h’: No such file or directory

At this time, you can download the corresponding ammintrin. H from the Internet, and put it in the directory of C:// program files (x86) \ \ Microsoft Visual Studio 10.0 \ \ VC \ \ include \, which can be downloaded from the following Baidu Library:

ammintrin. H header file, which is required after installing kb2519277 patch in Windows SDK 7.1

After installation, in the start menu, find “windows SDK 7.1 command prompt”, click Run, and set the corresponding compilation environment through setenv in the shell, as shown in the following figure:

After setting “setenv/x64”, you can install the corresponding package in the 64 bit compiling environment

At this point, you may need to mention that after setting up the environment, you can install numpy in Python 2.7 and python 3.4 respectively. You find that py2 is OK, but PY3 fails to install and compile link (you have tested it in the virtual machine before, but PY3 installation is OK). Why?Please compare the following two pictures:

Obviously, when py2 is installed, libpath under the link command line uses “” to cause it. Therefore, the path with spaces will not partition the parameters. PY3 is not so detailed. I don’t know whether it is the fault of PIP and setuptools calling the CMD command or the bug in distutils. Anyway, the installation path of PY3 can’t have spaces. So I adjusted the installation path of python3, that is, there is no space, and the compilation is successful

Of course, this is just a VC + + compilation environment. For a numerical calculation library like SciPy, you need a FORTRAN compiler to install it. Obviously, the compilation and installation under windows is far less convenient than that under Linux (except that the package name is not easy to remember and the package dependence is troublesome). GCC and gfortran are ready-made, and apt get is also ready-made. Therefore, if you develop and test under windows, you can directly use a large number of compiled and packaged windows wheel installation packages provided by the University of California, Irvine (UCI), which contain numpy, SciPy, Matplotlib and other module libraries for numerical analysis and scientific calculation, and all of them are MKL versions. Download the corresponding version and directly use “PIP install XXX. WHL” to complete the installation. The WHL file is just like a zip file. You can also use the compression software to unpack it and put it in the corresponding lib/site packages directory. Of course, you can also use the python customized environment version Anaconda , which has directly integrated the above packages, including the easy-to-use repl tool like IPython and CONDA package management