08:17:16,856 WARNING [de.example.logging.cdi.HttpWarningsHeaderFilter] (default task-1) Problem during formatting warning: java.lang.ArrayIndexOutOfBoundsException: 76
	at org.jboss.logmanager.JDKSpecific.calculateCaller(JDKSpecific.java:112)
	at org.jboss.logmanager.ExtLogRecord.calculateCaller(ExtLogRecord.java:335)
	at org.jboss.logmanager.ExtLogRecord.getSourceClassName(ExtLogRecord.java:399)
	at java.util.logging.SimpleFormatter.format(SimpleFormatter.java:143)
	at de.example.logging.cdi.HttpWarningsHeaderFilter.lambda$1(HttpWarningsHeaderFilter.java:34)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
	at de.example.logging.cdi.HttpWarningsHeaderFilter.filter(HttpWarningsHeaderFilter.java:39)
	at de.example.logging.cdi.HttpWarningsHeaderFilter$Proxy$_$$_WeldClientProxy.filter(Unknown Source)
	at org.jboss.resteasy.core.interception.ContainerResponseContextImpl.filter(ContainerResponseContextImpl.java:356)
	at org.jboss.resteasy.core.ServerResponseWriter.executeFilters(ServerResponseWriter.java:205)
	at org.jboss.resteasy.core.ServerResponseWriter.writeNomapResponse(ServerResponseWriter.java:82)
	at org.jboss.resteasy.core.ServerResponseWriter.writeNomapResponse(ServerResponseWriter.java:56)
	at org.jboss.resteasy.core.SynchronousDispatcher.writeResponse(SynchronousDispatcher.java:528)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:459)
	at org.jboss.resteasy.core.SynchronousDispatcher.lambda$invoke$4(SynchronousDispatcher.java:229)
	at org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess$0(SynchronousDispatcher.java:135)
	at org.jboss.resteasy.core.interception.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:355)

package de.example.logging.cdi;

import java.io.IOException;
import java.util.List;
import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;
import java.util.stream.Collectors;

import javax.inject.Inject;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.ext.Provider;

@Provider
public class HttpWarningsHeaderFilter implements ContainerResponseFilter {

	private static Logger log = Logger.getLogger(HttpWarningsHeaderFilter.class.getName());

	private static final Formatter simpleFormatter = new SimpleFormatter();

	@Inject
	Logs logs;

	@Override
	public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext)
			throws IOException {
		List<String> logStrings = logs.getLogRecords().stream()
				// only output INFO or more important warnings (SERVERE, WARNING)
				.filter(lr -> lr.getLevel().intValue() >= Level.INFO.intValue()).map(lr -> {
					try {
						return simpleFormatter.format(lr);
					} catch (Exception e) {
						log.log(Level.WARNING, "Problem during formatting warning", e);
						return lr.getMessage();
					}
				}).collect(Collectors.toList());
		responseContext.getHeaders().add("Warnings", logStrings);
	}

}