At first look through the tests I notice the pom generates a manifest that imports all jetty packages so maybe I'm just missing something - just needing to figure out what.
I'll take a further look through the tests tomorrow and see if I can figure out what's going on - whatever it is, it's consistent though as my Mac with Eclipse Oxygen and Java 8, and my Windows 10 machine with Java 11 and Eclipse 2020.06 both fail at the same point!
id State Bundle
0 ACTIVE org.eclipse.osgi_3.12.100.v20180210-1608
Fragments=34, 13
1 RESOLVED org.eclipse.jetty.servlet_9.4.30.v20200611
2 RESOLVED org.objectweb.asm.tree.analysis_8.0.1
4 ACTIVE org.eclipse.equinox.common_3.9.0.v20170207-1454
5 RESOLVED org.objectweb.asm_8.0.1
6 RESOLVED org.eclipse.osgi.services_3.6.0.v20170228-1906
7 RESOLVED org.apache.xml.serializer_2.7.1.v201005080400
8 RESOLVED org.mortbay.jasper.apache-el_8.5.54
9 ACTIVE org.eclipse.core.runtime_3.13.0.v20170207-1030
10 RESOLVED org.objectweb.asm.util_8.0.1
11 ACTIVE org.eclipse.jdt.core_3.13.102.v20180330-0919
Fragments=23, 43
12 RESOLVED org.eclipse.jetty.plus_9.4.30.v20200611
13 RESOLVED org.eclipse.osgi.compatibility.state_1.1.0.v20170516-1513
Master=0
14 ACTIVE org.eclipse.core.jobs_3.9.3.v20180115-1757
15 RESOLVED org.apache.xerces_2.9.0.v201101211617
16 STARTING org.eclipse.core.filesystem_1.7.0.v20170406-1337
Fragments=33
17 RESOLVED org.eclipse.jetty.xml_9.4.30.v20200611
18 RESOLVED org.objectweb.asm.tree_8.0.1
19 RESOLVED javax.annotation-api_1.3.0
21 RESOLVED org.eclipse.jetty.io_9.4.30.v20200611
22 RESOLVED org.eclipse.jetty.security_9.4.30.v20200611
23 RESOLVED org.eclipse.jdt.compiler.apt_1.3.110.v20180329-0935
Master=11
25 ACTIVE org.eclipse.equinox.preferences_3.7.0.v20170126-2132
26 ACTIVE org.eclipse.jetty.osgi.boot_9.4.30.v20200611
Fragments=56
30 RESOLVED org.apache.xml.resolver_1.2.0.v201005080400
31 RESOLVED org.eclipse.core.commands_3.9.0.v20170530-1048
32 RESOLVED org.eclipse.text_3.6.100.v20170203-0814
33 RESOLVED org.eclipse.core.filesystem.macosx_1.3.0.v20140124-1940
Master=16
34 RESOLVED javax.transaction_1.1.1.v201105210645
Master=0
35 RESOLVED javax.xml_1.3.4.v201005080400
36 RESOLVED org.eclipse.jetty.util_9.4.30.v20200611
37 ACTIVE org.eclipse.equinox.registry_3.7.0.v20170222-1344
38 RESOLVED org.eclipse.jetty.schemas_3.1.0.M0
39 RESOLVED org.eclipse.jetty.http_9.4.30.v20200611
40 ACTIVE org.apache.felix.gogo.runtime_0.10.0.v201209301036
41 ACTIVE org.eclipse.core.contenttype_3.6.0.v20170207-1037
42 RESOLVED org.w3c.dom.events_3.0.0.draft20060413_v201105210656
43 RESOLVED org.eclipse.jdt.compiler.tool_1.2.101.v20180329-0935
Master=11
44 STARTING com.ibm.icu_58.2.0.v20170418-1837
45 RESOLVED jetty-config-bundle_1.0.0.qualifier
46 ACTIVE org.apache.felix.gogo.command_0.10.0.v201209301215
47 ACTIVE org.eclipse.core.resources_3.12.0.v20170417-1558
48 RESOLVED org.apache.aries.spifly.dynamic.bundle_1.3.0
49 RESOLVED org.eclipse.jetty.server_9.4.30.v20200611
50 ACTIVE org.eclipse.equinox.app_1.3.400.v20150715-1528
51 RESOLVED org.eclipse.jetty.deploy_9.4.30.v20200611
52 RESOLVED org.eclipse.osgi.util_3.4.0.v20170111-1608
53 RESOLVED org.mortbay.jasper.apache-jsp_8.5.54
54 RESOLVED org.objectweb.asm.commons_8.0.1
55 STARTING org.eclipse.core.expressions_3.6.0.v20170207-1037
56 RESOLVED org.eclipse.jetty.osgi.boot.jsp_9.4.30.v20200611
Master=26
57 RESOLVED org.eclipse.jetty.webapp_9.4.30.v20200611
59 RESOLVED org.eclipse.jetty.jndi_9.4.30.v20200611
60 ACTIVE org.eclipse.jetty.annotations_9.4.30.v20200611
65 ACTIVE org.apache.taglibs.taglibs-standard-spec_1.2.5
68 RESOLVED org.apache.servicemix.bundles.bcel_5.2.0.4
69 ACTIVE org.apache.taglibs.standard-impl_1.2.5
74 RESOLVED org.apache.servicemix.bundles.xalan_2.7.1.4
75 RESOLVED org.apache.servicemix.bundles.xalan-serializer_2.7.2.1
77 ACTIVE org.apache.felix.gogo.shell_0.10.0.v201212101605
78 ACTIVE org.eclipse.equinox.console_1.1.300.v20170512-2111
82 RESOLVED org.eclipse.jetty.apache-jsp_9.4.30.v20200611
83 RESOLVED org.eclipse.jetty.apache.jstl_9.4.30.v20200611
85 RESOLVED org.eclipse.jetty.continuation_9.4.30.v20200611
86 RESOLVED javax.servlet-api_3.1.0
100 RESOLVED test-product_1.0.0.qualifier
101 ACTIVE common_1.0.0.qualifier