java cannot invoke because is null eclipse

stackoverflow.com › questions › 64001667 › cannot-invoke-because-is-null

I think your problem is related with the lack of a @Component annotation in your BoardDao class. The component should have a @Component annotation to instantiate the singleton to be injected in your Service Layer.

@Component
public class BoardDao extends SqlSessionDaoSupport{

    @Autowired
    SqlSessionTemplate session;

    public List<BoardDto> listboard(BoardDto dto) {
        System.out.println("dao.");
        List<BoardDto> result = session.selectList("boarddate.listboard", dto);
        return result;
    }

}

If the problem persist, you may try with the @Repository annotation. Sadly I haven't used the class SqlSessionDaoSupport, so I don't know exactly the best annotation for that.

Answer from Oscar Navarrete on Stack Overflow

GitHub

github.com › eclipse-pde › eclipse.pde › issues › 133

java.lang.NullPointerException: Cannot invoke "org.eclipse.pde.core.plugin.ModelEntry.getWorkspaceModels()" because "entry" is null · Issue #133 · eclipse-pde/eclipse.pde

May 31, 2022 - java.lang.NullPointerException: Cannot invoke "org.eclipse.pde.core.plugin.ModelEntry.getWorkspaceModels()" because "entry" is null at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupDirector.getSourceContainers(PDESourceLookupDirector.java:99) at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupQuery.getSourceContainers(PDESourceLookupQuery.java:321) at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupQuery.getSourceElement(PDESourceLookupQuery.java:283) at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupQuery.searchClasspathEntries(PD

Author: eclipse-pde

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Stack Overflow

stackoverflow.com › questions › 64001667 › cannot-invoke-because-is-null

java - Cannot invoke "" because "" is null - Stack Overflow

Top answer

1 of 2

@Component
public class BoardDao extends SqlSessionDaoSupport{

    @Autowired
    SqlSessionTemplate session;

    public List<BoardDto> listboard(BoardDto dto) {
        System.out.println("dao.");
        List<BoardDto> result = session.selectList("boarddate.listboard", dto);
        return result;
    }

}

If the problem persist, you may try with the @Repository annotation. Sadly I haven't used the class SqlSessionDaoSupport, so I don't know exactly the best annotation for that.

2 of 2

In my case it was with a Map, I wanted to increase its value, but this initial one will not exist, therefore it is null.

map.put(0, map.get(0) 1);

It was fixed by adding a validation, like so:

map.put(0, map.get(0) != null ? map.get(0) + 1 : 1);

Code2care

code2care.org › home page › java › java exception with lambda cannot invoke becasue object is null

[Fix] Java Exception with Lambda - Cannot invoke because object is null | Code2care

September 4, 2022 - import java.util.ArrayList; import java.util.List; public class Example { public static void main(String[] args) { List<String> stringList = new ArrayList<>(); stringList.add("Java"); stringList.add("Example"); stringList.add("Text"); stringList.add(null); stringList.forEach(str -> { if(str == null) { System.out.println("NULL Value"); } else { System.out.println(str.substring(1)); } }); } } Java 8 Exception - cannot invoke because the object is null

Eclipse

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572979 – java.lang.NullPointerException: Cannot invoke "org.eclipse.jdt.internal.compiler.lookup.TypeBinding.needsUncheckedConversion(org.eclipse.jdt.internal.compiler.lookup.TypeBinding)" because "argumentType" is null

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reddit.com › r/eclipse › java.lang.nullpointerexception: cannot invoke "java.sql.connection.createstatement()" because is null

r/eclipse on Reddit: java.lang.NullPointerException: Cannot invoke "java.sql.Connection.createStatement()" because is null

October 3, 2022 -

hello, im doing a list with SQL, and when i try to connect to the database, I always get this error, I already saw the ports, and everything is correct, but it says that it cannot connect, maybe a typing problem? can someone tell why what is wrong pls?

Top answer

1 of 1

The error speaks for itself, the connection is null, look at the stack traces of the previous exceptions.

GitHub

github.com › projectlombok › lombok › issues › 2788

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oneuptime.com › home › blog › how to handle 'cannot invoke method on null' errors

How to Handle 'Cannot invoke method on null' Errors

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forums.garmin.com › developer › connect-iq › f › discussion › 274440 › build-error-cannot-invoke-java-util-map-get-object-because-strings-is-null

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stackoverflow.com › questions › 79128692 › java-lang-nullpointerexception-cannot-invoke-because-the-return-value-of-is-nul › 79128696

spring boot - java.lang.NullPointerException: Cannot invoke because the return value of is null - Stack Overflow

Top answer

1 of 1

Replace Optional.of(profile.getTitle().name()).orElse(null) with Optional.ofNullable(profile.getTitle()).map(x->x.name()).orElse(null)

JetBrains

youtrack.jetbrains.com › issue › IDEA-297028

Jetbrains

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reddit.com › r/javahelp › exception in thread "main" java.lang.nullpointerexception: cannot invoke "java.net.url.toexternalform()" because "location" is null

r/javahelp on Reddit: Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null

May 18, 2023 -

https://pastebin.com/vtcMwSRn

So I am currently going crazy trying to get images to load when you export it to a .jar file. Before I was just using, "new imageicon("picturepath")"

As you can see from lines 30-34.

Then I found out that doesn't carry over when you make the project into a .jar file, okay cool. So I found out that you want to use, "getResource" okay cool got it. Try that and now I get the error in the title. when that location isn't fucking null so that's horse shit. I've tried every variation of that path. I have tried moving my images folder all over the project; from inside the src folder, where it is now, to just in the main project folder, etc. I don't know why it isn't happy.

Exception in thread "main" java.lang.NullPointerException: Cannot invoke 
"java.net.URL.toExternalForm()" because "location" is null
at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:234)
at LaunchPage.<init>(LaunchPage.java:25)
at Main.main(Main.java:5)

Top answer

1 of 2

When you use getResource() (on a class or a classloader) the file is assumed to be located on the classpath, paths may be relative or absolute, but on the classpath. For example, MyClass.getClass().getResource("myfile"), will look for myfile in the same packege as MyClass (the file are assumed to be located in the same folder as "MyClass.class" when the program runs). You may read more about it at: https://www.baeldung.com/java-class-vs-classloader-getresource https://docs.oracle.com/javase/8/docs/technotes/guides/lang/resources.html (it is old, but still relevant)

2 of 2

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