Try to press Ctrl and move mouse on "contains":
<h:outputText value=" yes" rendered="#

"/>

I get a lot of :

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.RangeCheck(ArrayList.java:546)
at java.util.ArrayList.get(ArrayList.java:321)
at org.jboss.tools.seam.text.ext.hyperlink.SeamBeanHyperlinkPartitioner.findJavaElements(SeamBeanHyperlinkPartitioner.java:288)
at org.jboss.tools.seam.text.ext.hyperlink.SeamBeanHyperlinkPartitioner.recognize(SeamBeanHyperlinkPartitioner.java:235)
at org.jboss.tools.common.text.ext.hyperlink.AbstractHyperlinkPartitioner.getChildPartitionType(AbstractHyperlinkPartitioner.java:49)
at org.jboss.tools.common.text.ext.hyperlink.AbstractHyperlinkPartitioner.getChildPartitionType(AbstractHyperlinkPartitioner.java:56)
at org.jboss.tools.common.text.ext.hyperlink.AbstractHyperlinkPartitioner.getChildPartitionType(AbstractHyperlinkPartitioner.java:56)
at org.jboss.tools.common.text.ext.hyperlink.AbstractHyperlinkPartitioner.getChildPartitionType(AbstractHyperlinkPartitioner.java:56)
at org.jboss.tools.common.text.ext.hyperlink.HyperlinkDetector.getPartitionTypes(HyperlinkDetector.java:79)
at org.jboss.tools.common.text.ext.hyperlink.xpl.BaseHyperlinkDetector.getPartitionType(BaseHyperlinkDetector.java:120)
at org.jboss.tools.common.text.ext.hyperlink.xpl.BaseHyperlinkDetector.getHyperlinks(BaseHyperlinkDetector.java:51)
at org.jboss.tools.common.text.ext.hyperlink.xpl.BaseHyperlinkDetector.detectHyperlinks(BaseHyperlinkDetector.java:132)