-bash: _get_comp_words_by_ref: command not found

When you try to use Spring Boot CLI shell completion, you might encounter the following error:

$ . ~/.sdkman/candidates/springboot/current/shell-completion/bash/spring
$ spring -bash: _get_comp_words_by_ref: command not found
-bash: [: -ne: unary operator expected

$

Install 'bash-completion' as follows:

brew install bash-completion
brew tap homebrew/completions

And add the following to '.bash_profile':

if [ -f $(brew --prefix)/etc/bash_completion ]; then
  . $(brew --prefix)/etc/bash_completion
fi

Apply the configuration as follows:

source ~/.bash_profile

and now you can see completion candidates as follows:

$ spring
grab       init       jar        shell      uninstall  war      
help       install    run        test       version  
$

References:
http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#getting-started-installing-the-cli
http://davidalger.com/development/bash-completion-on-os-x-with-brew/

Run Spring Boot application with another port with Gradle 'bootRun'

To run Spring Boot application with another port with Gradle 'bootRun', do as follows:

SERVER_PORT=28080 ./gradlew bootRun

error: unmappable character for encoding MS949

When you generate Javadoc with Gradle, you might encounter the following error:

error: unmappable character for encoding MS949

Add the following configuration to your `build.gradle`:

javadoc {
    options.encoding = 'UTF-8'
}

Reference:
http://stackoverflow.com/questions/25912190/how-to-set-an-encoding-for-the-javadoc-in-gradle

Error:java: Bad service configuration file, or exception thrown while constructing Processor object: javax.annotation.processing.Processor: Provider org.springframework.boot.configurationprocessor.ConfigurationMetadataAnnotationProcessor not found

When you run a test of Spring Boot in IntelliJ, you might be encounter the following error:

Error:java: Bad service configuration file, or exception thrown while constructing Processor object: javax.annotation.processing.Processor: Provider org.springframework.boot.configurationprocessor.ConfigurationMetadataAnnotationProcessor not found

I didn't dig into its root cause but I could detour the problem by removing the content in the file `spring-boot-tools/spring-boot-configuration-processor/src/main/resources/META-INF/services/javax.annotation.processing.Processor` as follows:

#org.springframework.boot.configurationprocessor.ConfigurationMetadataAnnotationProcessor

How to change the default Java class comment in IntelliJ

To change the default Java class comment in IntelliJ, do as follows:

IntelliJ IDEA -> Preferences... -> Editor -> File and Code Templates -> Includes -> File Header

Run textsum TensorFlow model

To run `textsum` TensorFlow model, do as follows:

git clone https://github.com/tensorflow/models.git

mkdir textsum_test
cd textsum_test/
ln -s ../models/textsum/data data
ln -s ../models/textsum/ textsum
touch WORKSPACE

bazel build -c opt textsum/...

bazel-bin/textsum/seq2seq_attention \
  --mode=train \
  --article_key=article \
  --abstract_key=abstract \
  --data_path=data/data \
  --vocab_path=data/vocab \
  --log_root=textsum/log_root \
  --train_dir=textsum/log_root/train

You can change max run steps with `--max_run_steps`.

Reference:
https://github.com/tensorflow/models/tree/master/textsum

AssertionError: Empty filelist.

When you run `textsum` TensorFlow model as follows:

bazel-bin/textsum/seq2seq_attention \
  --mode=train \
  --article_key=article \
  --abstract_key=abstract \
  --data_path=data/training-* \
  --vocab_path=data/vocab \
  --log_root=textsum/log_root \
  --train_dir=textsum/log_root/train

you might encounter the following error:

AssertionError: Empty filelist.

Replace `--data_path=data/training-*` with `--data_path=data/data` as follows:

bazel-bin/textsum/seq2seq_attention \
  --mode=train \
  --article_key=article \
  --abstract_key=abstract \
  --data_path=data/data \
  --vocab_path=data/vocab \
  --log_root=textsum/log_root \
  --train_dir=textsum/log_root/train

Reference:
https://github.com/tensorflow/models/issues/370

ImportError: cannot import name pywrap_tensorflow

When you import `tensorflow`, you might encounter the following error:

>>> import tensorflow
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "tensorflow/__init__.py", line 23, in <module>
    from tensorflow.python import *
  File "tensorflow/python/__init__.py", line 49, in <module>
    from tensorflow.python import pywrap_tensorflow
ImportError: cannot import name pywrap_tensorflow
>>>

If you're in the source directory of TensorFlow, moving out from it will solve the issue.

Reference:
https://github.com/tensorflow/tensorflow/issues/3217

Install TensorFlow from source on Mac

To install TensorFlow from source on Mac, do as follows:

git clone https://github.com/tensorflow/tensorflow

brew install bazel swig

sudo easy_install -U six
sudo easy_install -U numpy
sudo easy_install wheel

sudo easy_install ipython

./configure

bazel build -c opt //tensorflow/tools/pip_package:build_pip_package

bazel-bin/tensorflow/tools/pip_package/build_pip_package /tmp/tensorflow_pkg

sudo pip install /tmp/tensorflow_pkg/tensorflow-0.10.0-py2-none-any.whl

Reference:
https://www.tensorflow.org/versions/r0.10/get_started/os_setup.html#installing-from-sources

Check pip version

To check pip version, do as follows:

$ pip -V
pip 8.1.2 from /Library/Python/2.7/site-packages/pip-8.1.2-py2.7.egg (python 2.7)
$

Install pip in Mac

To install pip in Mac, do as follows:

sudo easy_install pip

Reference:
http://stackoverflow.com/questions/17271319/installing-pip-on-mac-os-x

How to exclude modules from Maven test

To exclude modules from Maven test, do as follows:

./mvnw clean test -pl \!:spring-boot-loader-tools,\!:spring-boot-cli,\!:spring-boot-gradle-tests

Reference:
http://stackoverflow.com/questions/5539348/how-to-exclude-a-module-from-a-maven-reactor-build

Run MariaDB as a service using Homebrew in Mac

To run MariaDB as a service using Homebrew in Mac, use the following command:

brew services start mariadb

Install Homebrew on Mac

To install Homebrew on Mac, use the following command:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Reference:
http://brew.sh/

Create a new space in OS X El Cpitan

Press `F3` to open Mission Control.

Press `+` button to create a new space.

References:
https://support.apple.com/kb/PH18757?locale=en_US
https://support.apple.com/kb/PH22059?locale=en_US&viewlocale=en_US

Apply package.json

To apply package.json, do as follows:

npm install

Concatenate in React

To concatenate in React, do as follows:

<a href={"/restaurants?landmarkId=" + this.props.landmark.id}>{this.props.landmark.name}</a>

Reference:
http://stackoverflow.com/questions/21668025/react-jsx-access-props-in-quotes

Warning: Unknown DOM property class. Did you mean className?

When you use React, you might encounter the following warning as follows:

Warning: Unknown DOM property class. Did you mean className?

Change `class` to `className`.

Set a custom data.sql in Spring Boot

To set a custom `data.sql` in Spring Boot, use `spring.datasource.data` as follows:

spring.datasource.data=classpath*:test/trust_data_20160907.sql

Backup only table data in MySQL

To backup only table data in MySQL, use `--no-create-info` as follows:

mysqldump -u trust -p db_trust --no-create-info > trust_data_20160907.sql

Reference:
http://stackoverflow.com/questions/5109993/mysqldump-data-only

Uncaught TypeError: client(...).done is not a function

When you use `rest` as follows:

    client({
      method: 'GET',
      path: '/api/employees'
    }).done(response => {
      this.setState({
        employees: response.entity._embedded.employees
      });
    });

you might get the following error:

Uncaught TypeError: client(...).done is not a function

Changing `done()` to `then()` as follows fixes the error:

    client({
      method: 'GET',
      path: '/api/employees'
    }).then(response => {
      this.setState({
        employees: response.entity._embedded.employees
      });
    });

Reference:
https://github.com/cujojs/rest

Uncaught TypeError: React.render is not a function

When you run the following code:

const React = require('react');

ReactDOM.render(
  <App />,
  document.getElementById('react')
);

you might encounter the following error:

Uncaught TypeError: React.render is not a function

Add `react-dom` as follows:

sudo npm install react-dom --save

Import and use it as follows:

const React = require('react');
const ReactDOM = require('react-dom');

ReactDOM.render(
  <App />,
  document.getElementById('react')
);

Reference:
http://stackoverflow.com/questions/26627665/error-with-basic-react-example-uncaught-typeerror-undefined-is-not-a-function

Module build failed: SyntaxError: Unexpected token

When you run `webpack` with React, you might encounter the following error:

Module build failed: SyntaxError: Unexpected token

Install `babel-preset-react` as follows:

sudo npm install babel-preset-react --save

add `query` to `webpack.config.js` as follows:

module.exports = {
  ...
  module: {
    loaders: [
      ...
      {
        test: /\.js$/,
        loader: 'babel',
        query: {
          presets: ['react']
        }
      }
    ]
  }
};

Reference:
http://stackoverflow.com/questions/33460420/babel-loader-jsx-syntaxerror-unexpected-token

Module build failed: ReferenceError: Promise is not defined

If you use webpack as follows:

webpack ./js/entry.js ./js/bundle.js

you might encounter the following error:

ERROR in /Users/izeye/~/css-loader!./css/style.css
Module build failed: ReferenceError: Promise is not defined
    at LazyResult.async (/Users/izeye/node_modules/css-loader/node_modules/postcss/lib/lazy-result.js:237:31)
    at LazyResult.then (/Users/izeye/node_modules/css-loader/node_modules/postcss/lib/lazy-result.js:141:21)
    at processCss (/Users/izeye/node_modules/css-loader/lib/processCss.js:199:5)
    at Object.module.exports (/Users/izeye/node_modules/css-loader/lib/loader.js:24:2)
 @ /Users/izeye/~/style-loader!/Users/izeye/~/css-loader!./css/style.css 4:14-91

Upgrade your Node.js to the latest version.

Reference:
https://github.com/webpack/css-loader/issues/145

Upgrade Node.js to the latest version

To upgrade Node.js to the latest version, use `n` as follows:

sudo npm install n -g
n stable

Reference:
http://stackoverflow.com/questions/10075990/upgrading-node-js-to-latest-version

Show Node.js version

To show Node.js version, do as follows:

$ node -v
v0.10.35
$

Convert `.mp4` to `.mp3` using ffmpeg

To convert `.mp4` to `.mp3` using ffmpeg, do as follows:

ffmpeg -i moon_20160905.mp4 -vn -acodec libmp3lame moon_20160905.mp3

Reference:
http://stackoverflow.com/questions/3032280/how-to-convert-mp4-to-mp3-in-java

Install ffmpeg in Ubuntu

To install ffmpeg in Ubuntu, do as follows:

git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg
cd ffmpeg
./configure --disable-yasm --enable-libmp3lame
make
sudo make install

Unknown encoder 'libmp3lame'

When you try to convert `.mp4` to `.mp3` with ffmpeg as follows:

ffmpeg -i moon_20160905.mp4 -vn -acodec libmp3lame moon_20160905.mp3

you might encounter the following error:

Unknown encoder 'libmp3lame'

Add `--enable-libmp3lame` when configuring ffmpeg as follows:

./configure --disable-yasm --enable-libmp3lame

ERROR: libmp3lame >= 3.98.3 not found

When you install ffmpeg with the following command in Ubuntu:

./configure --disable-yasm --enable-libmp3lame

you might encounter the following error:

ERROR: libmp3lame >= 3.98.3 not found

Install `libmp3lame-dev` with the following command:

sudo apt-get install libmp3lame-dev

Prevent RestTemplate from URL encoding of URL value which has already been encoded

To prevent `RestTemplate` from URL encoding of URL value which has already been encoded, use `UriComponentsBuilder` as follows:

uri = UriComponentsBuilder.fromHttpUrl(url).build(true).toUri();
echoed = restTemplate.getForObject(uri, String.class);
assertThat(echoed).isEqualTo(message);

Note the invocation on `build()` with `encoded` parameter having `true` value.

You can see the full sample code in: https://github.com/izeye/spring-boot-throwaway-branches/blob/rest/src/test/java/learningtest/org/springframework/web/client/RestTemplateTests.java

Reference:
http://stackoverflow.com/questions/28182836/resttemplate-to-not-escape-url