git grep 'printStackTrace()' | wc -l
45

git grep 'printStackTrace()' | grep -v '//' | wc -l
35

git grep -l 'printStackTrace()' | grep .java$ | grep -v -i test
eagledns/src/main/java/se/unlogic/standardutils/crypto/Base64.java
eagledns/src/main/java/se/unlogic/standardutils/threads/ThreadPoolTaskGroupHandler.java
eagledns/src/main/java/se/unlogic/standardutils/xml/XMLUtils.java
resteasy-jaxrs/src/main/java/org/jboss/resteasy/core/ExceptionAdapter.java
resteasy-jaxrs/src/main/java/org/jboss/resteasy/core/interception/jaxrs/ContainerResponseContextImpl.java
resteasy-spring/src/main/java/org/jboss/resteasy/springmvc/JettyLifecycleManager.java
server-adapters/resteasy-vertx/src/main/java/org/jboss/resteasy/plugins/server/vertx/VertxRequestHandler.java
tjws/src/main/java/Acme/Serve/Serve.java
tjws/src/main/java/Acme/Utils.java

git grep -l 'printStackTrace()' | grep .java$ | grep -i test
arquillian/RESTEASY-736-jetty/src/main/java/org/jboss/resteasy/resteasy736/TestResource.java
resteasy-jsapi/src/test/java/org/jboss/resteasy/test/i18n/TestMessagesAbstract.java
security-legacy/keystone/keystone-core/src/test/java/org/jboss/resteasy/test/keystone/TokenTest.java
server-adapters/resteasy-netty4/src/test/java/org/jboss/resteasy/test/AsyncJaxrsResource.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/providers/sse/SseEventSinkTest.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/providers/sse/SseResource.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/providers/sse/SseTest.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/response/AnotherPublisherResponseTest.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/response/PublisherResponseTest.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/validation/cdi/resource/ApplicationScopeRestServiceAppScoped.java
testsuite/integration-tests/src/test/java/org/jboss/resteasy/test/validation/cdi/resource/ApplicationScopeRestServiceReqScoped.java
testsuite/unit-tests/src/test/java/org/jboss/resteasy/test/client/ChunkedTransferEncodingUnitTest.java