Reading PEM-encoded encrypted private key from file in Java

I'm currently trying to read a pem file containing a private key. The key is generated by another system which uses Python and I receive a pem-file which I need to read the private key from. The content of the pem file looks like this:

In the other system, a collegue of mine was generating and reading the pem file with Python. He read the key like this:

from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import ec

def read(path):
    with open(path, "rb") as f:
        data = f.read()

    return data

# Load a PEM-encoded, encrypted private key
def load(path, passphrase):
    return serialization.load_pem_private_key(read(path), passphrase)

Right now, I have to read this generated pem-file in Java. Up until now I tried to read the content of the file via a FileInputStream and tried to generate the private key with the EncodedKeySpec class:

FileInputStream is = new FileInputStream(file);
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(is.readAllBytes());
KeyFactory factory = KeyFactory.getInstance("EC");
PrivateKey key = factory.generatePrivate(spec);

This way though I always receive an exception regarding the

java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException : Short read of DER length
    at jdk.crypto.ec/sun.security.ec.ECKeyFactory.engineGeneratePrivate(ECKeyFactory.java:169)
    at java.base/java.security.KeyFactory.generatePrivate(KeyFactory.java:390)
    at my.package.name.here.MyInputReader.loadKey(MyInputReader.java:107)
    at my.package.name.here.MyInputReader.createDLCBinary(MyInputReader.java:47)
    at my.package.name.here.MyInputReaderTest.test(MyInputReaderTest.java:11)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
    at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)
    at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1540)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.security.InvalidKeyException: IOException : Short read of DER length
    at java.base/sun.security.pkcs.PKCS8Key.decode(PKCS8Key.java:350)
    at java.base/sun.security.pkcs.PKCS8Key.decode(PKCS8Key.java:355)
    at jdk.crypto.ec/sun.security.ec.ECPrivateKeyImpl.<init>(ECPrivateKeyImpl.java:74)
    at jdk.crypto.ec/sun.security.ec.ECKeyFactory.implGeneratePrivate(ECKeyFactory.java:237)
    at jdk.crypto.ec/sun.security.ec.ECKeyFactory.engineGeneratePrivate(ECKeyFactory.java:165)
    ... 69 more

I noticed that my collegue used a password when reading the key from the pem file and I also have access to this password. Although I did not find any functionality to actually use the password on the file content. I might be missing something crucial here and I hope you can help me out with this.

UPDATE: This problem is also discussed in this thread and has some possible solutions to it: How to read a password encrypted key with java?

Solution

Thanks to @MichaelFehr and @dave_thompson_085 I got into the right direction. Unfortunately I won't be able to use commandlines and only work with Java code.

I looked for similar questions and came across this thread: How to read a password encrypted key with java?

I used the solution there to implement the following code snippet to read key files:

    public PrivateKey loadKey(String path, String passphrase) {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    try {
        File file = ResourceUtils.getFile(path);
        PEMParser pemParser = new PEMParser(new FileReader(file));
        Object o = pemParser.readObject();
        PrivateKeyInfo pki;

        if (o instanceof PKCS8EncryptedPrivateKeyInfo) {

            PKCS8EncryptedPrivateKeyInfo epki = (PKCS8EncryptedPrivateKeyInfo) o;

            JcePKCSPBEInputDecryptorProviderBuilder builder =
                    new JcePKCSPBEInputDecryptorProviderBuilder().setProvider("BC");

            InputDecryptorProvider idp = builder.build(passphrase.toCharArray());

            pki = epki.decryptPrivateKeyInfo(idp);
        } else if (o instanceof PEMEncryptedKeyPair) {

            PEMEncryptedKeyPair epki = (PEMEncryptedKeyPair) o;
            PEMKeyPair pkp = epki.decryptKeyPair(new BcPEMDecryptorProvider(passphrase.toCharArray()));

            pki = pkp.getPrivateKeyInfo();
        } else {
            throw new PKCSException("Invalid encrypted private key class: " + o.getClass().getName());
        }

        JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
        return converter.getPrivateKey(pki);
    } catch (Exception e) {
        System.out.println("Error happened while loading key");
        e.printStackTrace();
        return null;
    }
}

Not the best code in the world, but it will work for now and will be improved in the future. Thanks again for your help :)