When using web3j java library in a spring boot application, I am getting the below exception in the Web3j.build line. Any idea to fix this issue?

Question

java.lang.ClassNotFoundException: okhttp3.CipherSuite at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.web3j.protocol.http.HttpService.(HttpService.java:46) at com.relay.eth.ERC20TokenUtil.(ERC20TokenUtil.java:36) at com.relay.controller.open.APIController.getETHTokensBalance(APIController.java:398) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at

Using web3j java library in a spring boot application，start the springboot project to access this,

Web3j web3j = Web3j.build(new HttpService("https://mainnet.infura.io/v3/{token}"))

And show error msg.

    <dependency>
        <groupId>com.squareup.okhttp3</groupId>
        <artifactId>okhttp</artifactId>
        <version>4.9.0</version>
    </dependency>

    <dependency>
        <groupId>org.web3j</groupId>
        <artifactId>core</artifactId>
        <version>4.6.3</version>
        <exclusions>
            <exclusion>
                <artifactId>okhttp</artifactId>
                <groupId>com.squareup.okhttp3</groupId>
            </exclusion>
        </exclusions>
    </dependency>
       

Answer 1

You should also add some crypto provider as a dependency to your project, just like it is stated in web3j docs :

It has five runtime dependencies:

...

• Bouncy Castle (Spongy Castle on Android) for crypto

...

Answer 2

i changed the pom dependency version

    ```<dependency>
        <groupId>org.web3j</groupId>
        <artifactId>core</artifactId>
        <version>3.6.0</version>
    </dependency>
    ```

delete the okhttp3 dependency

and its wokrs