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<h1 id="debuggingsamples">DebuggingSamples</h1>
<p>
Sample repository with code snippets to practice debugging with IntelliJ
IDEA
</p>
<h1 id="examples">Examples</h1>
<h2 id="how-to-debug">How to debug</h2>
<br />
<p><img src="./doc/Images/StartDebuggingSession.gif" alt="" /></p>
<p>Start your Application in Debug Mode</p>
<pre><code>Shortcut: <br>SHIFT + F9</code></pre>
<p>
or press the green arrow and select "Debug Main". <br />
<br />
<img src="./doc/Images/StartSession.PNG" alt="" />
</p>
<p>
Set a breakpoint at any called position where you want to stop the
application.
</p>
<pre><code>Shortcut: <br>CTRL + F8</code></pre>
<p>
Step trough your app and inspect your variables & application behavior
</p>
<pre><code>Shortcut: <br>F8</code></pre>
<p>Continue execution of program</p>
<pre><code>Shortcut: <br>F9</code></pre>
<p>Terminate debugging session</p>
<pre><code>Shortcut: <br>CTRL + F2</code></pre>
<br />
<br />
<h2 id="breakpoints">Breakpoints</h2>
<p>
Breakpoints are special markers in the development environment that stop
regular program execution at a desired point. This allows the developer to
examine the program state and behavior to detect errors and incorrect
behavior.
</p>
<h3 id="types-of-breakpoints">Types of breakpoints</h3>
<p>
The following types of breakpoints are available in IntelliJ IDEA: (vgl.
<a
href="https://www.jetbrains.com/help/idea/using-breakpoints.html#set-breakpoints"
>JetBrains Reference</a
>)
</p>
<ul>
<li>
<p>
Line Breakpoints: Suspend the program upon reaching the line of code
where the breakpoint was set. This type of breakpoints can be set on
any executable line of code.<br />
</p>
<p><img src="./doc//Images/LineBreakpoints.PNG" alt="" /></p>
</li>
<li>
<p>
Method Breakpoints: Suspend the program upon entering or exiting the
specified method or one of its implementations, allowing you to check
the method's entry/exit conditions. <br />
<br />
<img src="./doc/Images/MethodBreakpoints.PNG" alt="" />
</p>
</li>
<li>
<p>
Field Watchpoints: To detect access and modification of fields if
caller source is unknown. <br />
<br />
<img src="./doc/Images/FieldBreakpoints.PNG" alt="" />
</p>
</li>
<li>
<p>
Exception Breakpoints: Hold application if specific exception occurs
</p>
<pre><code>CTRL + SHIFT + F8 --> View Breakpoints, ALT + Insert (Exception)
</code></pre>
<p><img src="./doc/Images/ExceptionSettings.gif" alt="" /></p>
<p>
Alternatively, check "Any Exception" to stop the application
if an exception occurs.
</p>
</li>
</ul>
<h3 id="conditional-debugging">Conditional Debugging</h3>
<p>
Hit breakpoint only if the specified condition is met. Especially useful
for loops.
</p>
<p><img src="./doc/Images/ConditionalDebugging.gif" alt="" /></p>
<h2 id="watches">Watches</h2>
<p>
Add any variable as Watch. This value then remains fixed in the
"Debugger window".
</p>
<p><img src="./doc/Images/Watches.gif" alt="" /></p>
<h2 id="removeoncehit">RemoveOnceHit</h2>
<p>
Sometimes a one time breakpoint is useful. For example if the developer
has to be sure his method is hit from the correct method. Set the 'Remove
Once Hit' Checkbox. <br>
<br>
<img src="./doc/Images/RemoveOnceHit.PNG" alt="" />
</p>
<h1 id="tipps-and-tricks">Tipps and Tricks</h1>
<h3 id="named-breakpoints">Named Breakpoints</h3>
<p>
Sometimes a lot of breakpoints are needed to understand the correct
behavior of the application. The developer can quickly lose the overview
and gets stuck on "wrong" breakpoints. <br />
The breakpoints can be easily "sorted" here and grouped per
feature / package. For example, for the "Exception Feature"
under point 1) all breakpoints of this feature can be deactivated with one
action. Point 2) demonstrates the named breakpoints.
<br>
<br>
<img src="./doc/Images/NamedGroupsBreakpointWindow.PNG" alt="" />
</p>
<h2 id="intellij-idea-shortcuts">IntelliJ IDEA Shortcuts</h2>
<blockquote>
<p>Toggle line/method/field Breakpoint Shortcut --> CTRL + F8</p>
<p>Edit breakpoint properties --> CTRL + SHIFT + F8</p>
<p>Further settings with --> CTRL + SHIFT + F8</p>
<p>Step further --> F8</p>
<p>Run to next breakpoint --> F9</p>
</blockquote>
<h2 id="google-search-engine">Google Search Engine</h2>
<ul>
<li>
<p>Use Placeholder:</p>
<blockquote>
<h3 id="wrong">Wrong</h3>
<blockquote>
<p>could not cast value of type DemoHomeClass to DemoClass</p>
<pre><code>About 7 results (0,56 seconds)></code></pre>
</blockquote>
<h3 id="better">Better:</h3>
<blockquote>
<p>Could not cast value of type * to type *</p>
<pre><code>About 1.550.000.000 results (0,51 seconds)></code></pre>
</blockquote>
<h3 id="further-improvement">Further Improvement:</h3>
<blockquote>
<p>
site: stackoverflow.com solved Could not cast value of type * to
type *
</p>
<pre><code>About 4.420.000 results (1,02 seconds)<br>--> StackOverflow Entry with solved question is first result</code></pre>
</blockquote>
</blockquote>
</li>
<li>
<p>Exclude Search Results:</p>
<blockquote>
<p>Mustang -Car Ford</p>
<pre><code>Show only horse results, exclude Cars</code></pre>
</blockquote>
</li>
<li>
<p>Must Have Search Terms:</p>
<blockquote>
<p>Mustang "Ford"</p>
<pre><code>Searches for cars, except horses</code></pre>
</blockquote>
</li>
<li>
<p>Combinations:</p>
<blockquote>
<p>-site: udemy "java spring boot"</p>
<pre><code>Show results for Java Spring Boot Courses on Udemy</code></pre>
<p>-site: udemy "java RestApi *"</p>
<pre><code>Search on Udemy for Java RestAPI results</code></pre>
<p>blog: java spring boot "jpa" 2020..2022</p>
<pre><code> Search for blog entries that can contain java spring boot and must contain "JPA" in the period from 2020 to 2022.</code></pre>
</blockquote>
</li>
</ul>
<h1 id="exercises">Exercises</h1>
<p>
Clone this Repository:
<a href="https://github.com/Thomas-Mildner/DebuggingSamples"
>https://github.com/Thomas-Mildner/DebuggingSamples</a
><br />
</p>
<ul>
<li>
LineBreakpoints:
<em>de.thro.vv.exercises.linebreakpoints.LineBreakpoints --> Main</em
><br />
</li>
<li>
MethodBreakpoints:
<em
>de.thro.vv.exercises.methodbreakpoints.MethodBreakpoints -->
Main</em
><br />
</li>
<li>
FieldBreakpoints:
<em
>de.thro.vv.exercises.fieldbreakpoints.FieldBreakpoints -->
Main</em
><br />
</li>
<li>
ConditionalDebugging:
<em
>de.thro.vv.exercises.conditionaldebugging.ConditionalDebugging -->
Main</em
><br />
</li>
<li>
ExceptionDebugging:
<em>de.thro.vv.exercises.exceptions.ExceptionDebugging --> Main</em>
<br />
</li>
</ul>
</body>
</html>