Several JAXP tests are attempting to make network connection, assuming that no proxy will be selected, and are tripped by default proxy selection on macOS:

javax/xml/jaxp/unittest/dom/DOMFeatureTest.java
javax/xml/jaxp/unittest/common/dtd/SAXTest.java
javax/xml/jaxp/unittest/common/dtd/DOMTest.java
javax/xml/jaxp/unittest/common/catalog/SAXTest.java
javax/xml/jaxp/unittest/common/catalog/DOMTest.java

These tests should ensure that no proxy will be selected by installing a default proxy selector that returns NO_PROXY.

Unlike on other platforms, java will pickup system proxies by default on macOS.