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Is ApplicationContext file necessary if I want to run the unit test?

everyone,
I'm new on web development. Recently, I start a tutorial to build Registration and Login with Spring Boot and MySQL Database. When I run the unit test, there are errors showing up. I cannot find ApplicationContext file in the tutorial, and also try serval methods on stack overflow e.g. change plug setting in pom.xml but isn't working.
Can anyone answer this problem?
Errors on IDE

The application context is not a file – it's a term Spring uses to describe the entire state of your application. So the error means that Spring is not able to start your application because of missing database configuration.

Looks like you are using maven (src/main/java). In this case put the applicationContext.xml file in the src/main/resources directory. It will be copied in the classpath directory and you should be able to access it with
#ContextConfiguration("/applicationContext.xml")
A plain path, for example, "context.xml", will be treated as a classpath resource from the same package in which the test class is defined. A path starting with a slash is treated as a fully qualified classpath location, for example "/org/example/config.xml".
So, it's important that you add the slash when referencing the file in the root directory of the classpath.

Read common external property file in Java Webapp and java normal app

I know this question has answered many a time with most useful answer as below,
Where to place and how to read configuration resource files in servlet based application?
However, We have some special requirement as below,
Webapp will be deployed to tomcat.
Normal java app in form of .jar will be placed under folder /myapp
myappConfig.property file will be placed under /myapp
Directory Structure on client machine
/myapp
/myapp.jar
/assests/myappConfig.property
/tomcat/webapps/myapp.war
Basically myapp.jar and myapp.war will access sql db connection values for MySql database connection and db operations.
Accessing myappConfig.property from myapp.jar --> Working fine
File jarPath = new File(Myapp.class.getProtectionDomain().getCodeSource().getLocation().getPath());
String propertiesPath = jarPath.getParent();
System.out.println(" propertiesPath-" + propertiesPath);
mainProperties.load(new FileInputStream(propertiesPath + "\\assets\\myapp.property"));
Can anyone help/suggest how to implement,
Accessing myappConfig.property file from mywebapp,
provided run time change in myappConfig.property file does not required myapp.war to be redeployed
Thanks for your help in advance.
edit
Below is the steps in which we want to deliver the project to client.
Below is my app directory
/myapp
/myapp.jar
/assests/myappConfig.property
/tomcat/webapps/myapp.war
pack everything in one package with some packaging tool.
Run this package in client machine at any location and it will have same directory structure as above
Here, I do not want to hard code any location in webapp or tomcat for "/assests/myappConfig.property"
Normal Java app I can read property file but for wepapp I am not getting clear idea for how to do that?

You can add a <context> to tomcat/conf/server.xml (in this example, linux path):
<Context docBase="/home/yourusername/tomcat/assests" path="/assets" />
If you are using Windows:
<Context docBase="C:\path\to\myapp\assets" path="/assets" />
And then you can access it like any other resource within your webapp (e.g.: /assets/myappConfig.property).
If you are using JDBC for example, you could store the connection properties in a Singleton and request it from there, and that class could take care of change checks on that file.

Can i set relative path to java.security.auth.login.config?

In my Spring Boot app i need to call to:
System.setProperty("java.security.auth.login.config", authConf);
where authConf seems to be expected as an absolute path to the file.
the problem is, my Spring Boot app is packaged and executed as a jar and i want to package the file inside the jar.
The answer provided in this question might work only when a WAR is deployed in a server. It doesn't seem to work when we run JARs with embedded container.
is there way i could set a relative path to java.security.auth.login.config to refer to my conf file packaged within my jar ?

I know that the answer is about 6 years too late, but I recently faced the same issue and found and answer. Maybe my answer will at least help the next dev who will face this issue. I was able to solve it is by first creating a javax.security.auth.login.Configuration of type JavaLoginConfig and then use the Configuration.setConfiguration(configuration method) of the same Configuration class. Using this method I was able to bundle our jaas.conf inside the jar and use a relative path to it.
To give a concrete example:
Get the URL of the security configuration file you want to use
URL configLocation=YourClass.getClassLoader().getResource("resources/jaas.conf);"
Create the JavaLoginConfig configuration
Configuration secConfig=Configuration.getInstance("JavaLoginConf", new URIParameter(configLocation.toURI());
Set the configuration to the one you created in step 2
Configuration.setConfiguration(secConfig);

Creating A File Resource Using Tomcat JNDI

I need to read an application.properties file from a servlet application using Tomcat container. The file can not be included in my war so it can't be under webapps or Tomcat root folder in any ways. The file has to be somewhere in the folder. I also can not use FileInputStream to read the properties file. Only option I have is to define a JNDI name for a folder / directory and look that JNDI properties during runtime to find the folder location to read the file. Is thee any working example out there?

I have chalked out a solution for myself reading the following similar posts and articles.
The Context Container
Reading a global variable from tomcat with JNDI. Example not working
java:comp/env is not bound
I have defined a Environment inside my Context for my web application under
\conf\Catalina\localhost\mywebapp.xml as follows....
<Environment name="propertiesfilelocation" value="E:\\tmp\\application.properties"
type="java.lang.String" override="false"/>
Then accessed my properties file using a JNDI lookup to get the file name.
Context ctx = new InitialContext();
Context envCtx = (Context)ctx.lookup("java:comp/env");
String propertiesFileLocation = (String) envCtx.lookup("propertiesfilelocation");
LOGGER.info("String property === " + propertiesFileLocation);
properties.load(new FileInputStream(propertiesFileLocation));
#home : Yes you are right it involved FileInputStream. However, I am happy with the solution because I am no longer hard coding my folder location inside my Java code which makes my app more portable.

I have a slightly different approach to a similar problem. I also toyed with the idea of JNDI but I found this a bit of overkill.
I found another article by BalusC. It allows you to specify folder relative to your tomcat installation and deploy all your properties files there. So you keep configuration external to your application but you don't require seperate configuration for every properties file for every app.
Here it the link:
Where to place and how to read configuration resource files in servlet based application?
and the preferred choice is as follows:
Put it in the classpath, so that you can load it by
ClassLoader#getResourceAsStream() with a classpath-relative path:
Properties properties = new Properties();
properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("filename.properties"));
Here filename.properties is supposed to be placed in one of the roots
which are covered by the default classpath of a webapp, e.g.
webapp/WEB-INF/lib, webapp/WEB-INF/classes, appserver/lib or JRE/lib.
If the properties file is webapp-specific, best is to place it in
WEB-INF/classes. If you're developing a project in an IDE, you can
also drop it in src folder (the project's source folder).
You can alternatively also put it somewhere outside the default
classpath and add its path to the classpath of the appserver. In for
example Tomcat you can configure it as shared.loader property of
tomcat/conf/catalina.properties.
I hope this helps.
Allan

system-properties in JBoss AS7

In the standlone.xml file in JBoss AS7, I have set the variable my.dir in system properties as
<system-properties>
<property name="my.dir" value="D:\\mylocation"
</system-properties>
Now I am trying to use this variable to specify the location of the keystore file in the standalone.xml in the following way
certificate-key-file="${my.dir}\cert\mycert.keystore"
However, while starting JBoss, I am getting IO exception as JBoss is not able to locate the path. Could you please let me know if I am doing anything wrong?

As far as I know the ssl element in the jboss web subsystem does not support system property substitution (yet). You have 3 choices:
Use an absolute path
Use a relative path from $JBOSS_AS7\bin location
Store the certificate in the default location where JBoss looks for them - ${user.home}/.keystore which is the operating system home directory the user running jboss.web.
See more details on jboss.web ssl configuration here.