Description of problem:
Package xmpcore fails to build from source in EPEL 7.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9:aggregate (default-cli) on project xmpcore: An error has occurred in JavaDocs report generation:
[ERROR] Exit code: 1 - /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPMeta.java:189: error: self-closing element not allowed
[ERROR] *        Must be <code>null</code> if the value is not relevant.<br/>
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPPathFactory.java:197: warning: empty <p> tag
[ERROR] * <p>
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPPathFactory.java:32: warning: empty <p> tag
[ERROR] * <p>
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPUtils.java:51: error: invalid entity &apos;
[ERROR] *            contain a separator. Defaults to &apos;&quot;&apos;
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPUtils.java:51: error: invalid entity &apos;
[ERROR] *            contain a separator. Defaults to &apos;&quot;&apos;
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPUtils.java:258: error: malformed HTML
[ERROR] *   		  	<li>&quot;value <> 0&quot; and &quot;value == 0&quot;
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/XMPUtils.java:258: error: bad use of '>'
[ERROR] *   		  	<li>&quot;value <> 0&quot; and &quot;value == 0&quot;
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/options/Options.java:95: error: unknown tag: emp
[ERROR] * @return Returns if <emp>all</emp> of the requested bits are set or not.
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/options/Options.java:95: error: unknown tag: emp
[ERROR] * @return Returns if <emp>all</emp> of the requested bits are set or not.
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/options/Options.java:125: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/options/SerializeOptions.java:47: error: invalid entity &bt;
[ERROR] /** Omit the &lt;x:xmpmeta&bt;-tag */
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/ByteBuffer.java:194: warning: no description for @param
[ERROR] * @param len
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/Latin1Converter.java:44: error: invalid entity &apos;
[ERROR] * like xmls &apos;&lt;&apos;). UTF-16/32 flavours do not require further proccessing.
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/Latin1Converter.java:44: error: invalid entity &apos;
[ERROR] * like xmls &apos;&lt;&apos;). UTF-16/32 flavours do not require further proccessing.
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:164: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:380: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:635: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:765: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:971: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:1002: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:1031: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:1066: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:1102: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPMetaImpl.java:1137: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPSerializerHelper.java:36: warning: no description for @throws
[ERROR] * @throws XMPException
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPUtilsImpl.java:76: error: invalid entity &apos;
[ERROR] *            contain a separator. Defaults to &apos;&quot;&apos;
[ERROR] ^
[ERROR] /builddir/build/BUILD/xmpcore-5.1.2/java/com/adobe/xmp/impl/XMPUtilsImpl.java:76: error: invalid entity &apos;
[ERROR] *            contain a separator. Defaults to &apos;&quot;&apos;
[ERROR] ^
[ERROR] 
[ERROR] Command line was: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.121-0.b13.el7_3.ppc64/jre/../bin/javadoc @options @packages
[ERROR] 
[ERROR] Refer to the generated Javadoc files in '/builddir/build/BUILD/xmpcore-5.1.2/target/site/apidocs' dir.
[ERROR] -> [Help 1]
Version-Release number of selected component (if applicable):
5.1.2-3.el7

Steps to Reproduce:
koji build --scratch epel7 xmpcore-5.1.2-3.el7.src.rpm

Additional info:
This package is tracked by Koschei. See:
http://apps.fedoraproject.org/koschei/package/xmpcore