ClassAliasPool.forName0: "java.lang.ClassNotFoundException: byte[" error when using custom ClassLoader

To reproduce the problem, put all necessary JARs to a temporary directory, like d:/temp/jars:

chronicle-algorithms-1.1.8.jar chronicle-bytes-1.7.34.jar chronicle-core-1.7.15.jar chronicle-map-3.13.0.jar chronicle-threads-1.7.7.jar chronicle-values-1.5.5.jar chronicle-wire-1.7.30.jar javapoet-1.5.1.jar slf4j-api.jar slf4j-nop.jar

Then have following “application” main class:

public class ApplicationMain {
	public static void main(String[] args) throws IOException {
		System.out.println("Opening and closing");

		ChronicleMapBuilder<byte[], byte[]> byteToByte =
				ChronicleMapBuilder.of(byte[].class, byte[].class)
						.name("sha-to-node")
						.entries(1).
						averageKeySize(20).
						averageValueSize(30);

		final File file = new File(args[0]);
		ChronicleMap<byte[], byte[]> map = byteToByte.createPersistedTo(file);
		map.close();
		map = byteToByte.createPersistedTo(file);
		map.close();
	}
}

and following “bootloader” main class:

public class BootLoaderMain {
	public static void main(String[] args) throws Exception {
		final List<URL> urls = new ArrayList<>();
		final File root = new File("d:/temp/jars");
		for (File file : root.listFiles()) {
			urls.add(file.toURL());
		}
		urls.add(BootLoaderMain.class.getResource("."));

		final ClassLoader classLoader = new URLClassLoader(urls.toArray(new URL[urls.size()]), null);
		final Class<?> mainClass = classLoader.loadClass("ApplicationMain");
		final Method mainMethod = mainClass.getDeclaredMethod("main", String[].class);
		mainMethod.invoke(null, new Object[] {new String[] {"d:/temp/chronicle"}});
	}
}

Running BootLoaderMain will result in following Exception:

Exception in thread "main" java.lang.reflect.InvocationTargetException
	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 BootLoaderMain.main(BootLoaderMain.java:29)
	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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: net.openhft.chronicle.core.io.IORuntimeException: java.lang.ClassNotFoundException: byte[
	at net.openhft.chronicle.wire.Wires$SerializeJavaLang.lambda$apply$3(Wires.java:390)
	at net.openhft.chronicle.wire.ScalarStrategy.readUsing(ScalarStrategy.java:74)
	at net.openhft.chronicle.wire.ValueIn.object(ValueIn.java:494)
	at net.openhft.chronicle.wire.TextWire$TextValueIn.objectWithInferredType0(TextWire.java:2909)
	at net.openhft.chronicle.wire.TextWire$TextValueIn.objectWithInferredType(TextWire.java:2882)
	at net.openhft.chronicle.wire.ValueIn.object(ValueIn.java:435)
	at net.openhft.chronicle.wire.SerializationStrategies$9.readUsing(SerializationStrategies.java:201)
	at net.openhft.chronicle.wire.TextWire$TextValueIn.marshallable(TextWire.java:2633)
	at net.openhft.chronicle.wire.ValueIn.object(ValueIn.java:482)
	at net.openhft.chronicle.wire.TextWire$TextValueIn.objectWithInferredType0(TextWire.java:2909)
	at net.openhft.chronicle.wire.TextWire$TextValueIn.objectWithInferredType(TextWire.java:2882)
	at net.openhft.chronicle.wire.TextWire$TextValueIn.typedMarshallable(TextWire.java:2694)
	at net.openhft.chronicle.map.ChronicleMapBuilder.openWithExistingFile(ChronicleMapBuilder.java:1756)
	at net.openhft.chronicle.map.ChronicleMapBuilder.createWithFile(ChronicleMapBuilder.java:1555)
	at net.openhft.chronicle.map.ChronicleMapBuilder.createPersistedTo(ChronicleMapBuilder.java:1484)
	at ApplicationMain.main(ApplicationMain.java:17)
	... 10 more
Caused by: java.lang.ClassNotFoundException: byte[
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at net.openhft.chronicle.core.pool.ClassAliasPool.forName0(ClassAliasPool.java:118)
	at net.openhft.chronicle.core.pool.ClassAliasPool.forName(ClassAliasPool.java:107)
	at net.openhft.chronicle.wire.Wires$SerializeJavaLang.lambda$apply$3(Wires.java:388)
	... 25 more

However, when changing following line:

		final ClassLoader classLoader = new URLClassLoader(urls.toArray(new URL[urls.size()]), null);

to:

		final ClassLoader classLoader = new URLClassLoader(urls.toArray(new URL[urls.size()]));

it will work as expected. AFAIU, there will be two different Class<byte[]>es and only the boot loader Class<byte[]> is handled correctly.

Motivation:

We are using a small “boot” ClassLoader to bootstrap our application once deployed (but not when developing and starting from the IDE). Now I have source code using Chronicle-Map which is working fine when started from the IDE: it’s using a ChronicleMap<byte[], byte[]> and has no problems accessing a test database file. However, when starting our deployed application, I’m getting above Exception.

[rogeriovalente]

I’m facing a similar problem. When the file doesn’t exists there is no exception and the data is stored to file.

This is the interface

public interface EnderecoServicoInterface {

  int MAX_VALUE_LENGTH_URL = 400;
  int MAX_VALUE_LENGTH_CHAVE = 100;

  public String getChave();

  public void setChave(@NotNull @MaxUtf8Length(EnderecoServicoInterface.MAX_VALUE_LENGTH_CHAVE) String parChave);

  public String getUrlServicoDesenv();

  public void setUrlServicoDesenv(
      @NotNull @MaxUtf8Length(EnderecoServicoInterface.MAX_VALUE_LENGTH_URL) String parUrlDesenv);

  public String getUrlServicoHomologa();

  public void setUrlServicoHomologa(
      @NotNull @MaxUtf8Length(EnderecoServicoInterface.MAX_VALUE_LENGTH_URL) String parUrlHomologa);

  public String getUrlServicoProducao();

  public void setUrlServicoProducao(
      @NotNull @MaxUtf8Length(EnderecoServicoInterface.MAX_VALUE_LENGTH_URL) String parUrlProducao);
}

This is how I create the map:

    final ChronicleMapBuilder<String, EnderecoServicoInterface> webservicesurlBuilder =
        ChronicleMapBuilder.of(String.class, EnderecoServicoInterface.class)
            .name("webservicesurlmap")
            .averageKeySize(EnderecoServicoCache.averageKeySize)
            .entries(EnderecoServicoCache.nEntries);

ChronicleMap<String, EnderecoServicoInterface> map = webservicesurlBuilder..createPersistedTo(new File(System.getProperty("java.io.tmpdir") + File.separator + "webservicesurlmap"));

And after put all data in map the close() method is invoked. Every time that I try through createPersistedTo() method is throwing the exception below.

Caused by: net.openhft.chronicle.core.io.IORuntimeException: java.lang.ClassNotFoundException: EnderecoServicoInterface

Any tips?

[minborg]

I am closing this issue as it appears to be solved using the PR merged in Core. @rogeriovalente please raise a separate issue if you still have problems with your map.