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2019-02-07 12:19:05 +00:00
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3 changed files with 30 additions and 24 deletions

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@@ -9,10 +9,10 @@ Also, we provide the <code class="literal">@SpanTag</code> annotation to add tag
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod();</pre><p>Annotating the method without any parameter leads to creating a new span whose name equals the annotated method name.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan("customNameOnTestMethod4")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod4();</pre><p>If you provide the value in the annotation (either directly or by setting the <code class="literal">name</code> parameter), the created span has the provided value as the name.</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// method declaration</span>
<em><span class="hl-annotation" style="color: gray">@NewSpan(name = "customNameOnTestMethod5")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod5();
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod5(<em><span class="hl-annotation" style="color: gray">@SpanTag("testTag")</span></em> String param);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// and method execution</span>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod5();</pre><p>You can combine both the name and a tag. Let&#8217;s focus on the latter.
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod5(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test"</span>);</pre><p>You can combine both the name and a tag. Let&#8217;s focus on the latter.
In this case, the value of the annotated method&#8217;s parameter runtime value becomes the value of the tag.
In our sample, the tag key is <code class="literal">testTag</code>, and the tag value is <code class="literal">test</code>.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan(name = "customNameOnTestMethod3")</span></em>
<em><span class="hl-annotation" style="color: gray">@Override</span></em>
@@ -21,23 +21,25 @@ In our sample, the tag key is <code class="literal">testTag</code>, and the tag
If you override the interface&#8217;s method and provide a different value for the <code class="literal">@NewSpan</code> annotation, the most
concrete one wins (in this case <code class="literal">customNameOnTestMethod3</code> is set).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_continuing_spans" href="#_continuing_spans"></a>11.3&nbsp;Continuing Spans</h2></div></div></div><p>If you want to add tags and annotations to an existing span, you can use the <code class="literal">@ContinueSpan</code> annotation, as shown in the following example:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// method declaration</span>
<em><span class="hl-annotation" style="color: gray">@ContinueSpan(log = "testMethod11")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod11();
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod11(<em><span class="hl-annotation" style="color: gray">@SpanTag("testTag11")</span></em> String param);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// method execution</span>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod11();
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod11(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test"</span>);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod13();</pre><p>(Note that, in contrast with the <code class="literal">@NewSpan</code> annotation ,you can also add logs with the <code class="literal">log</code> parameter.)</p><p>That way, the span gets continued and:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Log entries named <code class="literal">testMethod11.before</code> and <code class="literal">testMethod11.after</code> are created.</li><li class="listitem">If an exception is thrown, a log entry named <code class="literal">testMethod11.afterFailure</code> is also created.</li><li class="listitem">A tag with a key of <code class="literal">testTag11</code> and a value of <code class="literal">test</code> is created.</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_advanced_tag_setting" href="#_advanced_tag_setting"></a>11.4&nbsp;Advanced Tag Setting</h2></div></div></div><p>There are 3 different ways to add tags to a span. All of them are controlled by the <code class="literal">SpanTag</code> annotation.
The precedence is as follows:</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">Try with a bean of <code class="literal">TagValueResolver</code> type and a provided name.</li><li class="listitem">If the bean name has not been provided, try to evaluate an expression.
We search for a <code class="literal">TagValueExpressionResolver</code> bean.
The default implementation uses SPEL expression resolution.
<span class="strong"><strong>IMPORTANT</strong></span> You can only reference properties from the SPEL expression. Method execution is not allowed due to security constraints.</li><li class="listitem">If we do not find any expression to evaluate, return the <code class="literal">toString()</code> value of the parameter.</li></ol></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_custom_extractor" href="#_custom_extractor"></a>11.4.1&nbsp;Custom extractor</h3></div></div></div><p>The value of the tag for the following method is computed by an implementation of <code class="literal">TagValueResolver</code> interface.
Its class name has to be passed as the value of the <code class="literal">resolver</code> attribute.</p><p>Consider the following annotated method:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueResolver() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueResolver(
<em><span class="hl-annotation" style="color: gray">@SpanTag(key = "test", resolver = TagValueResolver.class)</span></em> String test) {
}</pre><p>Now further consider the following <code class="literal">TagValueResolver</code> bean implementation:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Bean(name = "myCustomTagValueResolver")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> TagValueResolver tagValueResolver() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> () -&gt; <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"Value from myCustomTagValueResolver"</span>;
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> parameter -&gt; <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"Value from myCustomTagValueResolver"</span>;
}</pre><p>The two preceding examples lead to setting a tag value equal to <code class="literal">Value from myCustomTagValueResolver</code>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_resolving_expressions_for_a_value" href="#_resolving_expressions_for_a_value"></a>11.4.2&nbsp;Resolving Expressions for a Value</h3></div></div></div><p>Consider the following annotated method:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueExpression() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueExpression(
<em><span class="hl-annotation" style="color: gray">@SpanTag(key = "test", expression = "'hello' + ' characters'")</span></em> String test) {
}</pre><p>No custom implementation of a <code class="literal">TagValueExpressionResolver</code> leads to evaluation of the SPEL expression, and a tag with a value of <code class="literal">4 characters</code> is set on the span.
If you want to use some other expression resolution mechanism, you can create your own implementation of the bean.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_using_the_tostring_method" href="#_using_the_tostring_method"></a>11.4.3&nbsp;Using the <code class="literal">toString()</code> method</h3></div></div></div><p>Consider the following annotated method:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForArgumentToString() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForArgumentToString(<em><span class="hl-annotation" style="color: gray">@SpanTag("test")</span></em> Long param) {
}</pre><p>Running the preceding method with a value of <code class="literal">15</code> leads to setting a tag with a String value of <code class="literal">"15"</code>.</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="multi__naming_spans.html">Prev</a>&nbsp;</td><td width="20%" align="center">&nbsp;</td><td width="40%" align="right">&nbsp;<a accesskey="n" href="multi__customizations.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">10.&nbsp;Naming spans&nbsp;</td><td width="20%" align="center"><a accesskey="h" href="multi_spring-cloud-sleuth.html">Home</a></td><td width="40%" align="right" valign="top">&nbsp;12.&nbsp;Customizations</td></tr></table></div></body></html>

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@@ -688,10 +688,10 @@ Also, we provide the <code class="literal">@SpanTag</code> annotation to add tag
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod();</pre><p>Annotating the method without any parameter leads to creating a new span whose name equals the annotated method name.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan("customNameOnTestMethod4")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod4();</pre><p>If you provide the value in the annotation (either directly or by setting the <code class="literal">name</code> parameter), the created span has the provided value as the name.</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// method declaration</span>
<em><span class="hl-annotation" style="color: gray">@NewSpan(name = "customNameOnTestMethod5")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod5();
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod5(<em><span class="hl-annotation" style="color: gray">@SpanTag("testTag")</span></em> String param);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// and method execution</span>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod5();</pre><p>You can combine both the name and a tag. Let&#8217;s focus on the latter.
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod5(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test"</span>);</pre><p>You can combine both the name and a tag. Let&#8217;s focus on the latter.
In this case, the value of the annotated method&#8217;s parameter runtime value becomes the value of the tag.
In our sample, the tag key is <code class="literal">testTag</code>, and the tag value is <code class="literal">test</code>.</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan(name = "customNameOnTestMethod3")</span></em>
<em><span class="hl-annotation" style="color: gray">@Override</span></em>
@@ -700,25 +700,27 @@ In our sample, the tag key is <code class="literal">testTag</code>, and the tag
If you override the interface&#8217;s method and provide a different value for the <code class="literal">@NewSpan</code> annotation, the most
concrete one wins (in this case <code class="literal">customNameOnTestMethod3</code> is set).</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_continuing_spans" href="#_continuing_spans"></a>11.3&nbsp;Continuing Spans</h2></div></div></div><p>If you want to add tags and annotations to an existing span, you can use the <code class="literal">@ContinueSpan</code> annotation, as shown in the following example:</p><pre class="programlisting"><span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// method declaration</span>
<em><span class="hl-annotation" style="color: gray">@ContinueSpan(log = "testMethod11")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod11();
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> testMethod11(<em><span class="hl-annotation" style="color: gray">@SpanTag("testTag11")</span></em> String param);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-comment">// method execution</span>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod11();
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod11(<span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"test"</span>);
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">this</span>.testBean.testMethod13();</pre><p>(Note that, in contrast with the <code class="literal">@NewSpan</code> annotation ,you can also add logs with the <code class="literal">log</code> parameter.)</p><p>That way, the span gets continued and:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Log entries named <code class="literal">testMethod11.before</code> and <code class="literal">testMethod11.after</code> are created.</li><li class="listitem">If an exception is thrown, a log entry named <code class="literal">testMethod11.afterFailure</code> is also created.</li><li class="listitem">A tag with a key of <code class="literal">testTag11</code> and a value of <code class="literal">test</code> is created.</li></ul></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_advanced_tag_setting" href="#_advanced_tag_setting"></a>11.4&nbsp;Advanced Tag Setting</h2></div></div></div><p>There are 3 different ways to add tags to a span. All of them are controlled by the <code class="literal">SpanTag</code> annotation.
The precedence is as follows:</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">Try with a bean of <code class="literal">TagValueResolver</code> type and a provided name.</li><li class="listitem">If the bean name has not been provided, try to evaluate an expression.
We search for a <code class="literal">TagValueExpressionResolver</code> bean.
The default implementation uses SPEL expression resolution.
<span class="strong"><strong>IMPORTANT</strong></span> You can only reference properties from the SPEL expression. Method execution is not allowed due to security constraints.</li><li class="listitem">If we do not find any expression to evaluate, return the <code class="literal">toString()</code> value of the parameter.</li></ol></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_custom_extractor" href="#_custom_extractor"></a>11.4.1&nbsp;Custom extractor</h3></div></div></div><p>The value of the tag for the following method is computed by an implementation of <code class="literal">TagValueResolver</code> interface.
Its class name has to be passed as the value of the <code class="literal">resolver</code> attribute.</p><p>Consider the following annotated method:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueResolver() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueResolver(
<em><span class="hl-annotation" style="color: gray">@SpanTag(key = "test", resolver = TagValueResolver.class)</span></em> String test) {
}</pre><p>Now further consider the following <code class="literal">TagValueResolver</code> bean implementation:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@Bean(name = "myCustomTagValueResolver")</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> TagValueResolver tagValueResolver() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> () -&gt; <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"Value from myCustomTagValueResolver"</span>;
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">return</span> parameter -&gt; <span xmlns:d="http://docbook.org/ns/docbook" class="hl-string">"Value from myCustomTagValueResolver"</span>;
}</pre><p>The two preceding examples lead to setting a tag value equal to <code class="literal">Value from myCustomTagValueResolver</code>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_resolving_expressions_for_a_value" href="#_resolving_expressions_for_a_value"></a>11.4.2&nbsp;Resolving Expressions for a Value</h3></div></div></div><p>Consider the following annotated method:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueExpression() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForTagValueExpression(
<em><span class="hl-annotation" style="color: gray">@SpanTag(key = "test", expression = "'hello' + ' characters'")</span></em> String test) {
}</pre><p>No custom implementation of a <code class="literal">TagValueExpressionResolver</code> leads to evaluation of the SPEL expression, and a tag with a value of <code class="literal">4 characters</code> is set on the span.
If you want to use some other expression resolution mechanism, you can create your own implementation of the bean.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="_using_the_tostring_method" href="#_using_the_tostring_method"></a>11.4.3&nbsp;Using the <code class="literal">toString()</code> method</h3></div></div></div><p>Consider the following annotated method:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@NewSpan</span></em>
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForArgumentToString() {
<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">void</span> getAnnotationForArgumentToString(<em><span class="hl-annotation" style="color: gray">@SpanTag("test")</span></em> Long param) {
}</pre><p>Running the preceding method with a value of <code class="literal">15</code> leads to setting a tag with a String value of <code class="literal">"15"</code>.</p></div></div></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_customizations" href="#_customizations"></a>12.&nbsp;Customizations</h1></div></div></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_http" href="#_http"></a>12.1&nbsp;HTTP</h2></div></div></div><p>If a customization of client / server parsing of the HTTP related spans is required,
just register a bean of type <code class="literal">brave.http.HttpClientParser</code> or
<code class="literal">brave.http.HttpServerParser</code>. If client /server sampling is required, just

View File

@@ -1440,10 +1440,10 @@ void testMethod4();</programlisting>
<simpara>If you provide the value in the annotation (either directly or by setting the <literal>name</literal> parameter), the created span has the provided value as the name.</simpara>
<programlisting language="java" linenumbering="unnumbered">// method declaration
@NewSpan(name = "customNameOnTestMethod5")
void testMethod5();
void testMethod5(@SpanTag("testTag") String param);
// and method execution
this.testBean.testMethod5();</programlisting>
this.testBean.testMethod5("test");</programlisting>
<simpara>You can combine both the name and a tag. Let&#8217;s focus on the latter.
In this case, the value of the annotated method&#8217;s parameter runtime value becomes the value of the tag.
In our sample, the tag key is <literal>testTag</literal>, and the tag value is <literal>test</literal>.</simpara>
@@ -1460,10 +1460,10 @@ concrete one wins (in this case <literal>customNameOnTestMethod3</literal> is se
<simpara>If you want to add tags and annotations to an existing span, you can use the <literal>@ContinueSpan</literal> annotation, as shown in the following example:</simpara>
<programlisting language="java" linenumbering="unnumbered">// method declaration
@ContinueSpan(log = "testMethod11")
void testMethod11();
void testMethod11(@SpanTag("testTag11") String param);
// method execution
this.testBean.testMethod11();
this.testBean.testMethod11("test");
this.testBean.testMethod13();</programlisting>
<simpara>(Note that, in contrast with the <literal>@NewSpan</literal> annotation ,you can also add logs with the <literal>log</literal> parameter.)</simpara>
<simpara>That way, the span gets continued and:</simpara>
@@ -1503,12 +1503,13 @@ The default implementation uses SPEL expression resolution.
Its class name has to be passed as the value of the <literal>resolver</literal> attribute.</simpara>
<simpara>Consider the following annotated method:</simpara>
<programlisting language="java" linenumbering="unnumbered">@NewSpan
public void getAnnotationForTagValueResolver() {
public void getAnnotationForTagValueResolver(
@SpanTag(key = "test", resolver = TagValueResolver.class) String test) {
}</programlisting>
<simpara>Now further consider the following <literal>TagValueResolver</literal> bean implementation:</simpara>
<programlisting language="java" linenumbering="unnumbered">@Bean(name = "myCustomTagValueResolver")
public TagValueResolver tagValueResolver() {
return () -&gt; "Value from myCustomTagValueResolver";
return parameter -&gt; "Value from myCustomTagValueResolver";
}</programlisting>
<simpara>The two preceding examples lead to setting a tag value equal to <literal>Value from myCustomTagValueResolver</literal>.</simpara>
</section>
@@ -1516,7 +1517,8 @@ public TagValueResolver tagValueResolver() {
<title>Resolving Expressions for a Value</title>
<simpara>Consider the following annotated method:</simpara>
<programlisting language="java" linenumbering="unnumbered">@NewSpan
public void getAnnotationForTagValueExpression() {
public void getAnnotationForTagValueExpression(
@SpanTag(key = "test", expression = "'hello' + ' characters'") String test) {
}</programlisting>
<simpara>No custom implementation of a <literal>TagValueExpressionResolver</literal> leads to evaluation of the SPEL expression, and a tag with a value of <literal>4 characters</literal> is set on the span.
If you want to use some other expression resolution mechanism, you can create your own implementation of the bean.</simpara>
@@ -1525,7 +1527,7 @@ If you want to use some other expression resolution mechanism, you can create yo
<title>Using the <literal>toString()</literal> method</title>
<simpara>Consider the following annotated method:</simpara>
<programlisting language="java" linenumbering="unnumbered">@NewSpan
public void getAnnotationForArgumentToString() {
public void getAnnotationForArgumentToString(@SpanTag("test") Long param) {
}</programlisting>
<simpara>Running the preceding method with a value of <literal>15</literal> leads to setting a tag with a String value of <literal>"15"</literal>.</simpara>
</section>